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[IPV6] IP6TUNNEL: Enable to control the handled inner protocol.
[linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <[email protected]>
1da177e4
LT		 7 * Alexey Kuznetsov <[email protected]>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <[email protected]>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4
LT		 64
65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
1da177e4
LT		 76#include <linux/if_tunnel.h>
77#include <linux/rtnetlink.h>
78
79#ifdef CONFIG_IPV6_PRIVACY
80#include <linux/random.h>
1da177e4
LT		 81#endif
82
83#include <asm/uaccess.h>
84
85#include <linux/proc_fs.h>
86#include <linux/seq_file.h>
87
88/* Set to 3 to get tracing... */
89#define ACONF_DEBUG 2
90
91#if ACONF_DEBUG >= 3
92#define ADBG(x) printk x
93#else
94#define ADBG(x)
95#endif
96
97#define INFINITY_LIFE_TIME 0xFFFFFFFF
98#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100#ifdef CONFIG_SYSCTL
101static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103#endif
104
105#ifdef CONFIG_IPV6_PRIVACY
106static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 107static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 108static void ipv6_regen_rndid(unsigned long data);
109
110static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 111#endif
112
113static int ipv6_count_addresses(struct inet6_dev *idev);
114
115/*
116 * Configured unicast address hash table
117 */
118static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119static DEFINE_RWLOCK(addrconf_hash_lock);
120
1da177e4
LT		 121static void addrconf_verify(unsigned long);
122
8d06afab 123static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 124static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129static int addrconf_ifdown(struct net_device *dev, int how);
130
e431b8c0 131static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 132static void addrconf_dad_timer(unsigned long data);
133static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 134static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 135static void addrconf_rs_timer(unsigned long data);
136static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
1ab1457c 139static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 140 struct prefix_info *pinfo);
141static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
e041c683 143static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 144
ab32ea5d 145struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 146 .forwarding = 0,
147 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
148 .mtu6 = IPV6_MIN_MTU,
149 .accept_ra = 1,
150 .accept_redirects = 1,
151 .autoconf = 1,
152 .force_mld_version = 0,
153 .dad_transmits = 1,
154 .rtr_solicits = MAX_RTR_SOLICITATIONS,
155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
157#ifdef CONFIG_IPV6_PRIVACY
158 .use_tempaddr = 0,
159 .temp_valid_lft = TEMP_VALID_LIFETIME,
160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
161 .regen_max_retry = REGEN_MAX_RETRY,
162 .max_desync_factor = MAX_DESYNC_FACTOR,
163#endif
164 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 165 .accept_ra_defrtr = 1,
c4fd30eb 166 .accept_ra_pinfo = 1,
930d6ff2
YH		 167#ifdef CONFIG_IPV6_ROUTER_PREF
168 .accept_ra_rtr_pref = 1,
52e16356 169 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 170#ifdef CONFIG_IPV6_ROUTE_INFO
171 .accept_ra_rt_info_max_plen = 0,
172#endif
930d6ff2 173#endif
fbea49e1 174 .proxy_ndp = 0,
0bcbc926 175 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 176};
177
ab32ea5d 178static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 179 .forwarding = 0,
180 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
181 .mtu6 = IPV6_MIN_MTU,
182 .accept_ra = 1,
183 .accept_redirects = 1,
184 .autoconf = 1,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189#ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195#endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
c4fd30eb 198 .accept_ra_pinfo = 1,
930d6ff2
YH		 199#ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
52e16356 201 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 202#ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204#endif
930d6ff2 205#endif
fbea49e1 206 .proxy_ndp = 0,
0bcbc926 207 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 208};
209
210/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
211#if 0
212const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
213#endif
214const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
1da177e4
LT		 216static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217{
218 if (del_timer(&ifp->timer))
219 __in6_ifa_put(ifp);
220}
221
222enum addrconf_timer_t
223{
224 AC_NONE,
225 AC_DAD,
226 AC_RS,
227};
228
229static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230 enum addrconf_timer_t what,
231 unsigned long when)
232{
233 if (!del_timer(&ifp->timer))
234 in6_ifa_hold(ifp);
235
236 switch (what) {
237 case AC_DAD:
238 ifp->timer.function = addrconf_dad_timer;
239 break;
240 case AC_RS:
241 ifp->timer.function = addrconf_rs_timer;
242 break;
243 default:;
244 }
245 ifp->timer.expires = jiffies + when;
246 add_timer(&ifp->timer);
247}
248
249/* Nobody refers to this device, we may destroy it. */
250
8814c4b5
YH		 251static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
252{
253 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
254 kfree(idev);
255}
256
1da177e4
LT		 257void in6_dev_finish_destroy(struct inet6_dev *idev)
258{
259 struct net_device *dev = idev->dev;
260 BUG_TRAP(idev->addr_list==NULL);
261 BUG_TRAP(idev->mc_list==NULL);
262#ifdef NET_REFCNT_DEBUG
263 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
264#endif
265 dev_put(dev);
266 if (!idev->dead) {
267 printk("Freeing alive inet6 device %p\n", idev);
268 return;
269 }
270 snmp6_free_dev(idev);
8814c4b5 271 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 272}
273
7159039a
YH		 274EXPORT_SYMBOL(in6_dev_finish_destroy);
275
1da177e4
LT		 276static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
277{
278 struct inet6_dev *ndev;
d88ae4cc 279 struct in6_addr maddr;
1da177e4
LT		 280
281 ASSERT_RTNL();
282
283 if (dev->mtu < IPV6_MIN_MTU)
284 return NULL;
285
1ab1457c 286 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 287
1ab1457c
YH		 288 if (ndev == NULL)
289 return NULL;
322f74a4
IO		 290
291 rwlock_init(&ndev->lock);
292 ndev->dev = dev;
293 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
294 ndev->cnf.mtu6 = dev->mtu;
295 ndev->cnf.sysctl = NULL;
296 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
297 if (ndev->nd_parms == NULL) {
298 kfree(ndev);
299 return NULL;
300 }
301 /* We refer to the device */
302 dev_hold(dev);
1da177e4 303
322f74a4
IO		 304 if (snmp6_alloc_dev(ndev) < 0) {
305 ADBG((KERN_WARNING
306 "%s(): cannot allocate memory for statistics; dev=%s.\n",
307 __FUNCTION__, dev->name));
308 neigh_parms_release(&nd_tbl, ndev->nd_parms);
309 ndev->dead = 1;
310 in6_dev_finish_destroy(ndev);
311 return NULL;
312 }
1da177e4 313
322f74a4
IO		 314 if (snmp6_register_dev(ndev) < 0) {
315 ADBG((KERN_WARNING
316 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
317 __FUNCTION__, dev->name));
318 neigh_parms_release(&nd_tbl, ndev->nd_parms);
319 ndev->dead = 1;
320 in6_dev_finish_destroy(ndev);
321 return NULL;
322 }
323
324 /* One reference from device. We must do this before
325 * we invoke __ipv6_regen_rndid().
326 */
327 in6_dev_hold(ndev);
1da177e4
LT		 328
329#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 330 init_timer(&ndev->regen_timer);
331 ndev->regen_timer.function = ipv6_regen_rndid;
332 ndev->regen_timer.data = (unsigned long) ndev;
333 if ((dev->flags&IFF_LOOPBACK) ||
334 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 335#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
336 dev->type == ARPHRD_SIT ||
337#endif
338 dev->type == ARPHRD_NONE) {
322f74a4
IO		 339 printk(KERN_INFO
340 "%s: Disabled Privacy Extensions\n",
341 dev->name);
342 ndev->cnf.use_tempaddr = -1;
343 } else {
344 in6_dev_hold(ndev);
345 ipv6_regen_rndid((unsigned long) ndev);
346 }
1da177e4
LT		 347#endif
348
53aadcc9
HX		 349 if (netif_running(dev) && netif_carrier_ok(dev))
350 ndev->if_flags |= IF_READY;
351
322f74a4
IO		 352 ipv6_mc_init_dev(ndev);
353 ndev->tstamp = jiffies;
1da177e4 354#ifdef CONFIG_SYSCTL
322f74a4
IO		 355 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
356 NET_IPV6_NEIGH, "ipv6",
357 &ndisc_ifinfo_sysctl_change,
358 NULL);
359 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 360#endif
30c4cf57
DS		 361 /* protected by rtnl_lock */
362 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 363
364 /* Join all-node multicast group */
365 ipv6_addr_all_nodes(&maddr);
366 ipv6_dev_mc_inc(dev, &maddr);
367
1da177e4
LT		 368 return ndev;
369}
370
371static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
372{
373 struct inet6_dev *idev;
374
375 ASSERT_RTNL();
376
377 if ((idev = __in6_dev_get(dev)) == NULL) {
378 if ((idev = ipv6_add_dev(dev)) == NULL)
379 return NULL;
380 }
c5e33bdd 381
1da177e4
LT		 382 if (dev->flags&IFF_UP)
383 ipv6_mc_up(idev);
384 return idev;
385}
386
387#ifdef CONFIG_SYSCTL
388static void dev_forward_change(struct inet6_dev *idev)
389{
390 struct net_device *dev;
391 struct inet6_ifaddr *ifa;
392 struct in6_addr addr;
393
394 if (!idev)
395 return;
396 dev = idev->dev;
397 if (dev && (dev->flags & IFF_MULTICAST)) {
398 ipv6_addr_all_routers(&addr);
1ab1457c 399
1da177e4
LT		 400 if (idev->cnf.forwarding)
401 ipv6_dev_mc_inc(dev, &addr);
402 else
403 ipv6_dev_mc_dec(dev, &addr);
404 }
405 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 406 if (ifa->flags&IFA_F_TENTATIVE)
407 continue;
1da177e4
LT		 408 if (idev->cnf.forwarding)
409 addrconf_join_anycast(ifa);
410 else
411 addrconf_leave_anycast(ifa);
412 }
413}
414
415
416static void addrconf_forward_change(void)
417{
418 struct net_device *dev;
419 struct inet6_dev *idev;
420
421 read_lock(&dev_base_lock);
422 for (dev=dev_base; dev; dev=dev->next) {
8814c4b5 423 rcu_read_lock();
1da177e4
LT		 424 idev = __in6_dev_get(dev);
425 if (idev) {
426 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
427 idev->cnf.forwarding = ipv6_devconf.forwarding;
428 if (changed)
429 dev_forward_change(idev);
430 }
8814c4b5 431 rcu_read_unlock();
1da177e4
LT		 432 }
433 read_unlock(&dev_base_lock);
434}
435#endif
436
437/* Nobody refers to this ifaddr, destroy it */
438
439void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
440{
441 BUG_TRAP(ifp->if_next==NULL);
442 BUG_TRAP(ifp->lst_next==NULL);
443#ifdef NET_REFCNT_DEBUG
444 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
445#endif
446
447 in6_dev_put(ifp->idev);
448
449 if (del_timer(&ifp->timer))
450 printk("Timer is still running, when freeing ifa=%p\n", ifp);
451
452 if (!ifp->dead) {
453 printk("Freeing alive inet6 address %p\n", ifp);
454 return;
455 }
456 dst_release(&ifp->rt->u.dst);
457
458 kfree(ifp);
459}
460
e55ffac6
BH		 461static void
462ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
463{
464 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 465 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 466
467 /*
468 * Each device address list is sorted in order of scope -
469 * global before linklocal.
470 */
471 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
472 ifap = &ifa->if_next) {
8a6ce0c0 473 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 474 break;
475 }
476
477 ifp->if_next = *ifap;
478 *ifap = ifp;
479}
480
1da177e4
LT		 481/* On success it returns ifp with increased reference count */
482
483static struct inet6_ifaddr *
484ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 485 int scope, u32 flags)
1da177e4
LT		 486{
487 struct inet6_ifaddr *ifa = NULL;
488 struct rt6_info *rt;
489 int hash;
490 int err = 0;
491
8814c4b5 492 rcu_read_lock_bh();
1da177e4
LT		 493 if (idev->dead) {
494 err = -ENODEV; /*XXX*/
495 goto out2;
496 }
497
498 write_lock(&addrconf_hash_lock);
499
500 /* Ignore adding duplicate addresses on an interface */
501 if (ipv6_chk_same_addr(addr, idev->dev)) {
502 ADBG(("ipv6_add_addr: already assigned\n"));
503 err = -EEXIST;
504 goto out;
505 }
506
322f74a4 507 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 508
509 if (ifa == NULL) {
510 ADBG(("ipv6_add_addr: malloc failed\n"));
511 err = -ENOBUFS;
512 goto out;
513 }
514
515 rt = addrconf_dst_alloc(idev, addr, 0);
516 if (IS_ERR(rt)) {
517 err = PTR_ERR(rt);
518 goto out;
519 }
520
1da177e4
LT		 521 ipv6_addr_copy(&ifa->addr, addr);
522
523 spin_lock_init(&ifa->lock);
524 init_timer(&ifa->timer);
525 ifa->timer.data = (unsigned long) ifa;
526 ifa->scope = scope;
527 ifa->prefix_len = pfxlen;
528 ifa->flags = flags | IFA_F_TENTATIVE;
529 ifa->cstamp = ifa->tstamp = jiffies;
530
57f5f544
KF		 531 ifa->rt = rt;
532
1da177e4
LT		 533 ifa->idev = idev;
534 in6_dev_hold(idev);
535 /* For caller */
536 in6_ifa_hold(ifa);
537
538 /* Add to big hash table */
539 hash = ipv6_addr_hash(addr);
540
541 ifa->lst_next = inet6_addr_lst[hash];
542 inet6_addr_lst[hash] = ifa;
543 in6_ifa_hold(ifa);
544 write_unlock(&addrconf_hash_lock);
545
546 write_lock(&idev->lock);
547 /* Add to inet6_dev unicast addr list. */
e55ffac6 548 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 549
550#ifdef CONFIG_IPV6_PRIVACY
551 if (ifa->flags&IFA_F_TEMPORARY) {
552 ifa->tmp_next = idev->tempaddr_list;
553 idev->tempaddr_list = ifa;
554 in6_ifa_hold(ifa);
555 }
556#endif
557
1da177e4
LT		 558 in6_ifa_hold(ifa);
559 write_unlock(&idev->lock);
560out2:
8814c4b5 561 rcu_read_unlock_bh();
1da177e4 562
fd92833a 563 if (likely(err == 0))
e041c683 564 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 565 else {
566 kfree(ifa);
567 ifa = ERR_PTR(err);
568 }
569
570 return ifa;
571out:
572 write_unlock(&addrconf_hash_lock);
573 goto out2;
574}
575
576/* This function wants to get referenced ifp and releases it before return */
577
578static void ipv6_del_addr(struct inet6_ifaddr *ifp)
579{
580 struct inet6_ifaddr *ifa, **ifap;
581 struct inet6_dev *idev = ifp->idev;
582 int hash;
583 int deleted = 0, onlink = 0;
584 unsigned long expires = jiffies;
585
586 hash = ipv6_addr_hash(&ifp->addr);
587
588 ifp->dead = 1;
589
590 write_lock_bh(&addrconf_hash_lock);
591 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
592 ifap = &ifa->lst_next) {
593 if (ifa == ifp) {
594 *ifap = ifa->lst_next;
595 __in6_ifa_put(ifp);
596 ifa->lst_next = NULL;
597 break;
598 }
599 }
600 write_unlock_bh(&addrconf_hash_lock);
601
602 write_lock_bh(&idev->lock);
603#ifdef CONFIG_IPV6_PRIVACY
604 if (ifp->flags&IFA_F_TEMPORARY) {
605 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
606 ifap = &ifa->tmp_next) {
607 if (ifa == ifp) {
608 *ifap = ifa->tmp_next;
609 if (ifp->ifpub) {
610 in6_ifa_put(ifp->ifpub);
611 ifp->ifpub = NULL;
612 }
613 __in6_ifa_put(ifp);
614 ifa->tmp_next = NULL;
615 break;
616 }
617 }
618 }
619#endif
620
1d142804 621 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 622 if (ifa == ifp) {
623 *ifap = ifa->if_next;
624 __in6_ifa_put(ifp);
625 ifa->if_next = NULL;
626 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
627 break;
628 deleted = 1;
1d142804 629 continue;
1da177e4
LT		 630 } else if (ifp->flags & IFA_F_PERMANENT) {
631 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
632 ifp->prefix_len)) {
633 if (ifa->flags & IFA_F_PERMANENT) {
634 onlink = 1;
635 if (deleted)
636 break;
637 } else {
638 unsigned long lifetime;
639
640 if (!onlink)
641 onlink = -1;
642
643 spin_lock(&ifa->lock);
644 lifetime = min_t(unsigned long,
645 ifa->valid_lft, 0x7fffffffUL/HZ);
646 if (time_before(expires,
647 ifa->tstamp + lifetime * HZ))
648 expires = ifa->tstamp + lifetime * HZ;
649 spin_unlock(&ifa->lock);
650 }
651 }
652 }
1d142804 653 ifap = &ifa->if_next;
1da177e4
LT		 654 }
655 write_unlock_bh(&idev->lock);
656
657 ipv6_ifa_notify(RTM_DELADDR, ifp);
658
e041c683 659 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 660
661 addrconf_del_timer(ifp);
662
663 /*
664 * Purge or update corresponding prefix
665 *
666 * 1) we don't purge prefix here if address was not permanent.
667 * prefix is managed by its own lifetime.
668 * 2) if there're no addresses, delete prefix.
669 * 3) if there're still other permanent address(es),
670 * corresponding prefix is still permanent.
671 * 4) otherwise, update prefix lifetime to the
672 * longest valid lifetime among the corresponding
673 * addresses on the device.
674 * Note: subsequent RA will update lifetime.
675 *
676 * --yoshfuji
677 */
678 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
679 struct in6_addr prefix;
680 struct rt6_info *rt;
681
682 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
683 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
684
685 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
686 if (onlink == 0) {
e0a1ad73 687 ip6_del_rt(rt);
1da177e4
LT		 688 rt = NULL;
689 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
690 rt->rt6i_expires = expires;
691 rt->rt6i_flags |= RTF_EXPIRES;
692 }
693 }
694 dst_release(&rt->u.dst);
695 }
696
697 in6_ifa_put(ifp);
698}
699
700#ifdef CONFIG_IPV6_PRIVACY
701static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
702{
703 struct inet6_dev *idev = ifp->idev;
704 struct in6_addr addr, *tmpaddr;
705 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
706 int tmp_plen;
707 int ret = 0;
708 int max_addresses;
709
710 write_lock(&idev->lock);
711 if (ift) {
712 spin_lock_bh(&ift->lock);
713 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
714 spin_unlock_bh(&ift->lock);
715 tmpaddr = &addr;
716 } else {
717 tmpaddr = NULL;
718 }
719retry:
720 in6_dev_hold(idev);
721 if (idev->cnf.use_tempaddr <= 0) {
722 write_unlock(&idev->lock);
723 printk(KERN_INFO
724 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
725 in6_dev_put(idev);
726 ret = -1;
727 goto out;
728 }
729 spin_lock_bh(&ifp->lock);
730 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
731 idev->cnf.use_tempaddr = -1; /*XXX*/
732 spin_unlock_bh(&ifp->lock);
733 write_unlock(&idev->lock);
734 printk(KERN_WARNING
735 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
736 in6_dev_put(idev);
737 ret = -1;
738 goto out;
739 }
740 in6_ifa_hold(ifp);
741 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
742 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
743 spin_unlock_bh(&ifp->lock);
744 write_unlock(&idev->lock);
745 printk(KERN_WARNING
746 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
747 in6_ifa_put(ifp);
748 in6_dev_put(idev);
749 ret = -1;
750 goto out;
751 }
752 memcpy(&addr.s6_addr[8], idev->rndid, 8);
753 tmp_valid_lft = min_t(__u32,
754 ifp->valid_lft,
755 idev->cnf.temp_valid_lft);
1ab1457c
YH		 756 tmp_prefered_lft = min_t(__u32,
757 ifp->prefered_lft,
1da177e4
LT		 758 idev->cnf.temp_prefered_lft - desync_factor / HZ);
759 tmp_plen = ifp->prefix_len;
760 max_addresses = idev->cnf.max_addresses;
761 tmp_cstamp = ifp->cstamp;
762 tmp_tstamp = ifp->tstamp;
763 spin_unlock_bh(&ifp->lock);
764
765 write_unlock(&idev->lock);
766 ift = !max_addresses ||
1ab1457c 767 ipv6_count_addresses(idev) < max_addresses ?
1da177e4
LT		 768 ipv6_add_addr(idev, &addr, tmp_plen,
769 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
770 if (!ift || IS_ERR(ift)) {
771 in6_ifa_put(ifp);
772 in6_dev_put(idev);
773 printk(KERN_INFO
774 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
775 tmpaddr = &addr;
776 write_lock(&idev->lock);
777 goto retry;
778 }
779
780 spin_lock_bh(&ift->lock);
781 ift->ifpub = ifp;
782 ift->valid_lft = tmp_valid_lft;
783 ift->prefered_lft = tmp_prefered_lft;
784 ift->cstamp = tmp_cstamp;
785 ift->tstamp = tmp_tstamp;
786 spin_unlock_bh(&ift->lock);
787
788 addrconf_dad_start(ift, 0);
789 in6_ifa_put(ift);
790 in6_dev_put(idev);
791out:
792 return ret;
793}
794#endif
795
796/*
072047e4 797 * Choose an appropriate source address (RFC3484)
1da177e4 798 */
072047e4
YH		 799struct ipv6_saddr_score {
800 int addr_type;
801 unsigned int attrs;
802 int matchlen;
0d27b427 803 int scope;
072047e4
YH		 804 unsigned int rule;
805};
806
807#define IPV6_SADDR_SCORE_LOCAL 0x0001
808#define IPV6_SADDR_SCORE_PREFERRED 0x0004
809#define IPV6_SADDR_SCORE_HOA 0x0008
810#define IPV6_SADDR_SCORE_OIF 0x0010
811#define IPV6_SADDR_SCORE_LABEL 0x0020
812#define IPV6_SADDR_SCORE_PRIVACY 0x0040
813
b6f99a21 814static inline int ipv6_saddr_preferred(int type)
1da177e4 815{
072047e4
YH		 816 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
817 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
818 return 1;
819 return 0;
1da177e4
LT		 820}
821
072047e4 822/* static matching label */
b6f99a21 823static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 824{
825 /*
826 * prefix (longest match) label
827 * -----------------------------
828 * ::1/128 0
829 * ::/0 1
830 * 2002::/16 2
831 * ::/96 3
832 * ::ffff:0:0/96 4
102128e3
ŁS		 833 * fc00::/7 5
834 * 2001::/32 6
072047e4
YH		 835 */
836 if (type & IPV6_ADDR_LOOPBACK)
837 return 0;
838 else if (type & IPV6_ADDR_COMPATv4)
839 return 3;
840 else if (type & IPV6_ADDR_MAPPED)
841 return 4;
102128e3
ŁS		 842 else if (addr->s6_addr32[0] == htonl(0x20010000))
843 return 6;
072047e4
YH		 844 else if (addr->s6_addr16[0] == htons(0x2002))
845 return 2;
102128e3
ŁS		 846 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
847 return 5;
072047e4
YH		 848 return 1;
849}
1da177e4 850
072047e4 851int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 852 struct in6_addr *daddr, struct in6_addr *saddr)
853{
072047e4
YH		 854 struct ipv6_saddr_score hiscore;
855 struct inet6_ifaddr *ifa_result = NULL;
856 int daddr_type = __ipv6_addr_type(daddr);
857 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
858 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
859 struct net_device *dev;
1da177e4 860
072047e4 861 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 862
072047e4 863 read_lock(&dev_base_lock);
8814c4b5 864 rcu_read_lock();
1da177e4 865
072047e4
YH		 866 for (dev = dev_base; dev; dev=dev->next) {
867 struct inet6_dev *idev;
868 struct inet6_ifaddr *ifa;
869
870 /* Rule 0: Candidate Source Address (section 4)
871 * - multicast and link-local destination address,
872 * the set of candidate source address MUST only
873 * include addresses assigned to interfaces
874 * belonging to the same link as the outgoing
875 * interface.
876 * (- For site-local destination addresses, the
877 * set of candidate source addresses MUST only
878 * include addresses assigned to interfaces
879 * belonging to the same site as the outgoing
880 * interface.)
881 */
882 if ((daddr_type & IPV6_ADDR_MULTICAST ||
883 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
884 daddr_dev && dev != daddr_dev)
885 continue;
1da177e4 886
1da177e4 887 idev = __in6_dev_get(dev);
072047e4
YH		 888 if (!idev)
889 continue;
890
891 read_lock_bh(&idev->lock);
892 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
893 struct ipv6_saddr_score score;
894
895 score.addr_type = __ipv6_addr_type(&ifa->addr);
896
6b3ae80a
YH		 897 /* Rule 0:
898 * - Tentative Address (RFC2462 section 5.4)
899 * - A tentative address is not considered
900 * "assigned to an interface" in the traditional
901 * sense.
902 * - Candidate Source Address (section 4)
072047e4
YH		 903 * - In any case, anycast addresses, multicast
904 * addresses, and the unspecified address MUST
905 * NOT be included in a candidate set.
906 */
6b3ae80a
YH		 907 if (ifa->flags & IFA_F_TENTATIVE)
908 continue;
072047e4
YH		 909 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
910 score.addr_type & IPV6_ADDR_MULTICAST)) {
911 LIMIT_NETDEBUG(KERN_DEBUG
912 "ADDRCONF: unspecified / multicast address"
913 "assigned as unicast address on %s",
914 dev->name);
915 continue;
916 }
917
918 score.attrs = 0;
919 score.matchlen = 0;
920 score.scope = 0;
921 score.rule = 0;
922
923 if (ifa_result == NULL) {
924 /* record it if the first available entry */
925 goto record_it;
926 }
927
928 /* Rule 1: Prefer same address */
929 if (hiscore.rule < 1) {
930 if (ipv6_addr_equal(&ifa_result->addr, daddr))
931 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
932 hiscore.rule++;
933 }
934 if (ipv6_addr_equal(&ifa->addr, daddr)) {
935 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
936 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
937 score.rule = 1;
938 goto record_it;
1da177e4 939 }
072047e4
YH		 940 } else {
941 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
942 continue;
1da177e4 943 }
1da177e4 944
072047e4
YH		 945 /* Rule 2: Prefer appropriate scope */
946 if (hiscore.rule < 2) {
947 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
948 hiscore.rule++;
949 }
950 score.scope = __ipv6_addr_src_scope(score.addr_type);
951 if (hiscore.scope < score.scope) {
952 if (hiscore.scope < daddr_scope) {
953 score.rule = 2;
954 goto record_it;
955 } else
956 continue;
957 } else if (score.scope < hiscore.scope) {
958 if (score.scope < daddr_scope)
e55ffac6 959 break; /* addresses sorted by scope */
072047e4
YH		 960 else {
961 score.rule = 2;
962 goto record_it;
963 }
964 }
1da177e4 965
072047e4
YH		 966 /* Rule 3: Avoid deprecated address */
967 if (hiscore.rule < 3) {
968 if (ipv6_saddr_preferred(hiscore.addr_type) ||
969 !(ifa_result->flags & IFA_F_DEPRECATED))
970 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
971 hiscore.rule++;
972 }
973 if (ipv6_saddr_preferred(score.addr_type) ||
974 !(ifa->flags & IFA_F_DEPRECATED)) {
975 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
976 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
977 score.rule = 3;
978 goto record_it;
979 }
980 } else {
981 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
982 continue;
983 }
1da177e4 984
3b9f9a1c
NT		 985 /* Rule 4: Prefer home address */
986#ifdef CONFIG_IPV6_MIP6
987 if (hiscore.rule < 4) {
988 if (ifa_result->flags & IFA_F_HOMEADDRESS)
989 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
990 hiscore.rule++;
991 }
992 if (ifa->flags & IFA_F_HOMEADDRESS) {
993 score.attrs |= IPV6_SADDR_SCORE_HOA;
994 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
995 score.rule = 4;
996 goto record_it;
997 }
998 } else {
999 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1000 continue;
1001 }
1002#else
220bbd74
YH		 1003 if (hiscore.rule < 4)
1004 hiscore.rule++;
3b9f9a1c 1005#endif
072047e4
YH		 1006
1007 /* Rule 5: Prefer outgoing interface */
1008 if (hiscore.rule < 5) {
1009 if (daddr_dev == NULL ||
1010 daddr_dev == ifa_result->idev->dev)
1011 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1012 hiscore.rule++;
1013 }
1014 if (daddr_dev == NULL ||
1015 daddr_dev == ifa->idev->dev) {
1016 score.attrs |= IPV6_SADDR_SCORE_OIF;
1017 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1018 score.rule = 5;
1019 goto record_it;
1020 }
1021 } else {
1022 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1023 continue;
1024 }
1025
1026 /* Rule 6: Prefer matching label */
1027 if (hiscore.rule < 6) {
1028 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1029 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1030 hiscore.rule++;
1031 }
1032 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1033 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1034 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1035 score.rule = 6;
1036 goto record_it;
1da177e4 1037 }
072047e4
YH		 1038 } else {
1039 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1040 continue;
1041 }
1042
44fd0261 1043#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1044 /* Rule 7: Prefer public address
1045 * Note: prefer temprary address if use_tempaddr >= 2
1046 */
1047 if (hiscore.rule < 7) {
1048 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1049 (ifa_result->idev->cnf.use_tempaddr >= 2))
1050 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1051 hiscore.rule++;
1052 }
1053 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1054 (ifa->idev->cnf.use_tempaddr >= 2)) {
1055 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1056 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1057 score.rule = 7;
1058 goto record_it;
1059 }
1060 } else {
1061 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1062 continue;
1063 }
5e2707fa
YH		 1064#else
1065 if (hiscore.rule < 7)
1066 hiscore.rule++;
44fd0261 1067#endif
072047e4 1068 /* Rule 8: Use longest matching prefix */
12da2a43 1069 if (hiscore.rule < 8) {
072047e4 1070 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1071 hiscore.rule++;
1072 }
072047e4
YH		 1073 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1074 if (score.matchlen > hiscore.matchlen) {
1075 score.rule = 8;
1076 goto record_it;
1da177e4 1077 }
072047e4
YH		 1078#if 0
1079 else if (score.matchlen < hiscore.matchlen)
1080 continue;
1081#endif
1082
1083 /* Final Rule: choose first available one */
1084 continue;
1085record_it:
1086 if (ifa_result)
1087 in6_ifa_put(ifa_result);
1088 in6_ifa_hold(ifa);
1089 ifa_result = ifa;
1090 hiscore = score;
1da177e4 1091 }
072047e4 1092 read_unlock_bh(&idev->lock);
1da177e4 1093 }
8814c4b5 1094 rcu_read_unlock();
1da177e4
LT		 1095 read_unlock(&dev_base_lock);
1096
072047e4
YH		 1097 if (!ifa_result)
1098 return -EADDRNOTAVAIL;
1ab1457c 1099
072047e4
YH		 1100 ipv6_addr_copy(saddr, &ifa_result->addr);
1101 in6_ifa_put(ifa_result);
1102 return 0;
1da177e4
LT		 1103}
1104
1105
1106int ipv6_get_saddr(struct dst_entry *dst,
1107 struct in6_addr *daddr, struct in6_addr *saddr)
1108{
7a3025b1 1109 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1110}
1111
7159039a 1112EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4
LT		 1113
1114int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1115{
1116 struct inet6_dev *idev;
1117 int err = -EADDRNOTAVAIL;
1118
8814c4b5 1119 rcu_read_lock();
1da177e4
LT		 1120 if ((idev = __in6_dev_get(dev)) != NULL) {
1121 struct inet6_ifaddr *ifp;
1122
1123 read_lock_bh(&idev->lock);
1124 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1125 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1126 ipv6_addr_copy(addr, &ifp->addr);
1127 err = 0;
1128 break;
1129 }
1130 }
1131 read_unlock_bh(&idev->lock);
1132 }
8814c4b5 1133 rcu_read_unlock();
1da177e4
LT		 1134 return err;
1135}
1136
1137static int ipv6_count_addresses(struct inet6_dev *idev)
1138{
1139 int cnt = 0;
1140 struct inet6_ifaddr *ifp;
1141
1142 read_lock_bh(&idev->lock);
1143 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1144 cnt++;
1145 read_unlock_bh(&idev->lock);
1146 return cnt;
1147}
1148
1149int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1150{
1151 struct inet6_ifaddr * ifp;
1152 u8 hash = ipv6_addr_hash(addr);
1153
1154 read_lock_bh(&addrconf_hash_lock);
1155 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1156 if (ipv6_addr_equal(&ifp->addr, addr) &&
1157 !(ifp->flags&IFA_F_TENTATIVE)) {
1158 if (dev == NULL || ifp->idev->dev == dev ||
1159 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1160 break;
1161 }
1162 }
1163 read_unlock_bh(&addrconf_hash_lock);
1164 return ifp != NULL;
1165}
1166
7159039a
YH		 1167EXPORT_SYMBOL(ipv6_chk_addr);
1168
1da177e4
LT		 1169static
1170int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1171{
1172 struct inet6_ifaddr * ifp;
1173 u8 hash = ipv6_addr_hash(addr);
1174
1175 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1176 if (ipv6_addr_equal(&ifp->addr, addr)) {
1177 if (dev == NULL || ifp->idev->dev == dev)
1178 break;
1179 }
1180 }
1181 return ifp != NULL;
1182}
1183
1184struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1185{
1186 struct inet6_ifaddr * ifp;
1187 u8 hash = ipv6_addr_hash(addr);
1188
1189 read_lock_bh(&addrconf_hash_lock);
1190 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1191 if (ipv6_addr_equal(&ifp->addr, addr)) {
1192 if (dev == NULL || ifp->idev->dev == dev ||
1193 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1194 in6_ifa_hold(ifp);
1195 break;
1196 }
1197 }
1198 }
1199 read_unlock_bh(&addrconf_hash_lock);
1200
1201 return ifp;
1202}
1203
1204int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1205{
1206 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1207 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1208 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1209 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1210 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1211 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1212 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1213 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1214
1215 if (!sk2_rcv_saddr && !sk_ipv6only)
1216 return 1;
1217
1218 if (addr_type2 == IPV6_ADDR_ANY &&
1219 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1220 return 1;
1221
1222 if (addr_type == IPV6_ADDR_ANY &&
1223 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1224 return 1;
1225
1226 if (sk2_rcv_saddr6 &&
1227 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1228 return 1;
1229
1230 if (addr_type == IPV6_ADDR_MAPPED &&
1231 !sk2_ipv6only &&
1232 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1233 return 1;
1234
1235 return 0;
1236}
1237
1238/* Gets referenced address, destroys ifaddr */
1239
9f5336e2 1240static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1241{
1da177e4
LT		 1242 if (ifp->flags&IFA_F_PERMANENT) {
1243 spin_lock_bh(&ifp->lock);
1244 addrconf_del_timer(ifp);
1245 ifp->flags |= IFA_F_TENTATIVE;
1246 spin_unlock_bh(&ifp->lock);
1247 in6_ifa_put(ifp);
1248#ifdef CONFIG_IPV6_PRIVACY
1249 } else if (ifp->flags&IFA_F_TEMPORARY) {
1250 struct inet6_ifaddr *ifpub;
1251 spin_lock_bh(&ifp->lock);
1252 ifpub = ifp->ifpub;
1253 if (ifpub) {
1254 in6_ifa_hold(ifpub);
1255 spin_unlock_bh(&ifp->lock);
1256 ipv6_create_tempaddr(ifpub, ifp);
1257 in6_ifa_put(ifpub);
1258 } else {
1259 spin_unlock_bh(&ifp->lock);
1260 }
1261 ipv6_del_addr(ifp);
1262#endif
1263 } else
1264 ipv6_del_addr(ifp);
1265}
1266
3c21edbd
YH		 1267void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1268{
1269 if (net_ratelimit())
1270 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1271 addrconf_dad_stop(ifp);
1272}
1da177e4
LT		 1273
1274/* Join to solicited addr multicast group. */
1275
1276void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1277{
1278 struct in6_addr maddr;
1279
1280 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1281 return;
1282
1283 addrconf_addr_solict_mult(addr, &maddr);
1284 ipv6_dev_mc_inc(dev, &maddr);
1285}
1286
1287void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1288{
1289 struct in6_addr maddr;
1290
1291 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1292 return;
1293
1294 addrconf_addr_solict_mult(addr, &maddr);
1295 __ipv6_dev_mc_dec(idev, &maddr);
1296}
1297
20380731 1298static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1299{
1300 struct in6_addr addr;
1301 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1302 if (ipv6_addr_any(&addr))
1303 return;
1304 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1305}
1306
20380731 1307static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1308{
1309 struct in6_addr addr;
1310 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1311 if (ipv6_addr_any(&addr))
1312 return;
1313 __ipv6_dev_ac_dec(ifp->idev, &addr);
1314}
1315
073a8e0e
YH		 1316static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1317{
1318 if (dev->addr_len != ETH_ALEN)
1319 return -1;
1320 memcpy(eui, dev->dev_addr, 3);
1321 memcpy(eui + 5, dev->dev_addr + 3, 3);
1322
1323 /*
1324 * The zSeries OSA network cards can be shared among various
1325 * OS instances, but the OSA cards have only one MAC address.
1326 * This leads to duplicate address conflicts in conjunction
1327 * with IPv6 if more than one instance uses the same card.
1328 *
1329 * The driver for these cards can deliver a unique 16-bit
1330 * identifier for each instance sharing the same card. It is
1331 * placed instead of 0xFFFE in the interface identifier. The
1332 * "u" bit of the interface identifier is not inverted in this
1333 * case. Hence the resulting interface identifier has local
1334 * scope according to RFC2373.
1335 */
1336 if (dev->dev_id) {
1337 eui[3] = (dev->dev_id >> 8) & 0xFF;
1338 eui[4] = dev->dev_id & 0xFF;
1339 } else {
1340 eui[3] = 0xFF;
1341 eui[4] = 0xFE;
1342 eui[0] ^= 2;
1343 }
1344 return 0;
1345}
1346
1347static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1348{
1349 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1350 if (dev->addr_len != ARCNET_ALEN)
1351 return -1;
1352 memset(eui, 0, 7);
1353 eui[7] = *(u8*)dev->dev_addr;
1354 return 0;
1355}
1356
1357static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1358{
1359 if (dev->addr_len != INFINIBAND_ALEN)
1360 return -1;
1361 memcpy(eui, dev->dev_addr + 12, 8);
1362 eui[0] |= 2;
1363 return 0;
1364}
1365
1da177e4
LT		 1366static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1367{
1368 switch (dev->type) {
1369 case ARPHRD_ETHER:
1370 case ARPHRD_FDDI:
1371 case ARPHRD_IEEE802_TR:
073a8e0e 1372 return addrconf_ifid_eui48(eui, dev);
1da177e4 1373 case ARPHRD_ARCNET:
073a8e0e 1374 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1375 case ARPHRD_INFINIBAND:
073a8e0e 1376 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1377 }
1378 return -1;
1379}
1380
1381static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1382{
1383 int err = -1;
1384 struct inet6_ifaddr *ifp;
1385
1386 read_lock_bh(&idev->lock);
1387 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1388 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1389 memcpy(eui, ifp->addr.s6_addr+8, 8);
1390 err = 0;
1391 break;
1392 }
1393 }
1394 read_unlock_bh(&idev->lock);
1395 return err;
1396}
1397
1398#ifdef CONFIG_IPV6_PRIVACY
1399/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1400static int __ipv6_regen_rndid(struct inet6_dev *idev)
1401{
1da177e4 1402regen:
955189ef 1403 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1404 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1405
1406 /*
1407 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1408 * check if generated address is not inappropriate
1409 *
1410 * - Reserved subnet anycast (RFC 2526)
1411 * 11111101 11....11 1xxxxxxx
1412 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1413 * 00-00-5E-FE-xx-xx-xx-xx
1414 * - value 0
1415 * - XXX: already assigned to an address on the device
1416 */
1ab1457c 1417 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1418 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1419 (idev->rndid[7]&0x80))
1420 goto regen;
1421 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1422 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1423 goto regen;
1424 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1425 goto regen;
1426 }
1427
1428 return 0;
1429}
1430
1431static void ipv6_regen_rndid(unsigned long data)
1432{
1433 struct inet6_dev *idev = (struct inet6_dev *) data;
1434 unsigned long expires;
1435
8814c4b5 1436 rcu_read_lock_bh();
1da177e4
LT		 1437 write_lock_bh(&idev->lock);
1438
1439 if (idev->dead)
1440 goto out;
1441
1442 if (__ipv6_regen_rndid(idev) < 0)
1443 goto out;
1ab1457c 1444
1da177e4 1445 expires = jiffies +
1ab1457c 1446 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1447 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1448 if (time_before(expires, jiffies)) {
1449 printk(KERN_WARNING
1450 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1451 idev->dev->name);
1452 goto out;
1453 }
1454
1455 if (!mod_timer(&idev->regen_timer, expires))
1456 in6_dev_hold(idev);
1457
1458out:
1459 write_unlock_bh(&idev->lock);
8814c4b5 1460 rcu_read_unlock_bh();
1da177e4
LT		 1461 in6_dev_put(idev);
1462}
1463
1464static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1465 int ret = 0;
1466
1467 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1468 ret = __ipv6_regen_rndid(idev);
1469 return ret;
1470}
1471#endif
1472
1473/*
1474 * Add prefix route.
1475 */
1476
1477static void
1478addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1479 unsigned long expires, u32 flags)
1da177e4 1480{
86872cb5
TG		 1481 struct fib6_config cfg = {
1482 .fc_table = RT6_TABLE_PREFIX,
1483 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1484 .fc_ifindex = dev->ifindex,
1485 .fc_expires = expires,
1486 .fc_dst_len = plen,
1487 .fc_flags = RTF_UP | flags,
1488 };
1da177e4 1489
86872cb5 1490 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1491
1492 /* Prevent useless cloning on PtP SIT.
1493 This thing is done here expecting that the whole
1494 class of non-broadcast devices need not cloning.
1495 */
0be669bb 1496#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1497 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1498 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1499#endif
1da177e4 1500
86872cb5 1501 ip6_route_add(&cfg);
1da177e4
LT		 1502}
1503
1504/* Create "default" multicast route to the interface */
1505
1506static void addrconf_add_mroute(struct net_device *dev)
1507{
86872cb5
TG		 1508 struct fib6_config cfg = {
1509 .fc_table = RT6_TABLE_LOCAL,
1510 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1511 .fc_ifindex = dev->ifindex,
1512 .fc_dst_len = 8,
1513 .fc_flags = RTF_UP,
1514 };
1515
1516 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1517
1518 ip6_route_add(&cfg);
1da177e4
LT		 1519}
1520
0be669bb 1521#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1522static void sit_route_add(struct net_device *dev)
1523{
86872cb5
TG		 1524 struct fib6_config cfg = {
1525 .fc_table = RT6_TABLE_MAIN,
1526 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1527 .fc_ifindex = dev->ifindex,
1528 .fc_dst_len = 96,
1529 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1530 };
1da177e4
LT		 1531
1532 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1533 ip6_route_add(&cfg);
1da177e4 1534}
0be669bb 1535#endif
1da177e4
LT		 1536
1537static void addrconf_add_lroute(struct net_device *dev)
1538{
1539 struct in6_addr addr;
1540
1541 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1542 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1543}
1544
1545static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1546{
1547 struct inet6_dev *idev;
1548
1549 ASSERT_RTNL();
1550
1551 if ((idev = ipv6_find_idev(dev)) == NULL)
1552 return NULL;
1553
1554 /* Add default multicast route */
1555 addrconf_add_mroute(dev);
1556
1557 /* Add link local route */
1558 addrconf_add_lroute(dev);
1559 return idev;
1560}
1561
1562void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1563{
1564 struct prefix_info *pinfo;
1565 __u32 valid_lft;
1566 __u32 prefered_lft;
1567 int addr_type;
1568 unsigned long rt_expires;
1569 struct inet6_dev *in6_dev;
1570
1571 pinfo = (struct prefix_info *) opt;
1ab1457c 1572
1da177e4
LT		 1573 if (len < sizeof(struct prefix_info)) {
1574 ADBG(("addrconf: prefix option too short\n"));
1575 return;
1576 }
1ab1457c 1577
1da177e4
LT		 1578 /*
1579 * Validation checks ([ADDRCONF], page 19)
1580 */
1581
1582 addr_type = ipv6_addr_type(&pinfo->prefix);
1583
1584 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1585 return;
1586
1587 valid_lft = ntohl(pinfo->valid);
1588 prefered_lft = ntohl(pinfo->prefered);
1589
1590 if (prefered_lft > valid_lft) {
1591 if (net_ratelimit())
1592 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1593 return;
1594 }
1595
1596 in6_dev = in6_dev_get(dev);
1597
1598 if (in6_dev == NULL) {
1599 if (net_ratelimit())
1600 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1601 return;
1602 }
1603
1604 /*
1605 * Two things going on here:
1606 * 1) Add routes for on-link prefixes
1607 * 2) Configure prefixes with the auto flag set
1608 */
1609
1610 /* Avoid arithmetic overflow. Really, we could
1611 save rt_expires in seconds, likely valid_lft,
1612 but it would require division in fib gc, that it
1613 not good.
1614 */
1615 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1616 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1617 else
3dd4bc68
YH		 1618 rt_expires = valid_lft * HZ;
1619
1620 /*
1621 * We convert this (in jiffies) to clock_t later.
1622 * Avoid arithmetic overflow there as well.
1623 * Overflow can happen only if HZ < USER_HZ.
1624 */
1625 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1626 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1627
1628 if (pinfo->onlink) {
1629 struct rt6_info *rt;
1630 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1631
1632 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1633 if (rt->rt6i_flags&RTF_EXPIRES) {
1634 if (valid_lft == 0) {
e0a1ad73 1635 ip6_del_rt(rt);
1da177e4
LT		 1636 rt = NULL;
1637 } else {
3dd4bc68 1638 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1639 }
1640 }
1641 } else if (valid_lft) {
1642 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1643 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1644 }
1645 if (rt)
1646 dst_release(&rt->u.dst);
1647 }
1648
1649 /* Try to figure out our local address for this prefix */
1650
1651 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1652 struct inet6_ifaddr * ifp;
1653 struct in6_addr addr;
1654 int create = 0, update_lft = 0;
1655
1656 if (pinfo->prefix_len == 64) {
1657 memcpy(&addr, &pinfo->prefix, 8);
1658 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1659 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1660 in6_dev_put(in6_dev);
1661 return;
1662 }
1663 goto ok;
1664 }
1665 if (net_ratelimit())
1666 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1667 pinfo->prefix_len);
1668 in6_dev_put(in6_dev);
1669 return;
1670
1671ok:
1672
1673 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1674
1675 if (ifp == NULL && valid_lft) {
1676 int max_addresses = in6_dev->cnf.max_addresses;
1677
1678 /* Do not allow to create too much of autoconfigured
1679 * addresses; this would be too easy way to crash kernel.
1680 */
1681 if (!max_addresses ||
1682 ipv6_count_addresses(in6_dev) < max_addresses)
1683 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1684 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1685
1686 if (!ifp || IS_ERR(ifp)) {
1687 in6_dev_put(in6_dev);
1688 return;
1689 }
1690
1691 update_lft = create = 1;
1692 ifp->cstamp = jiffies;
1693 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1694 }
1695
1696 if (ifp) {
1697 int flags;
1698 unsigned long now;
1699#ifdef CONFIG_IPV6_PRIVACY
1700 struct inet6_ifaddr *ift;
1701#endif
1702 u32 stored_lft;
1703
1704 /* update lifetime (RFC2462 5.5.3 e) */
1705 spin_lock(&ifp->lock);
1706 now = jiffies;
1707 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1708 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1709 else
1710 stored_lft = 0;
1711 if (!update_lft && stored_lft) {
1712 if (valid_lft > MIN_VALID_LIFETIME ||
1713 valid_lft > stored_lft)
1714 update_lft = 1;
1715 else if (stored_lft <= MIN_VALID_LIFETIME) {
1716 /* valid_lft <= stored_lft is always true */
1717 /* XXX: IPsec */
1718 update_lft = 0;
1719 } else {
1720 valid_lft = MIN_VALID_LIFETIME;
1721 if (valid_lft < prefered_lft)
1722 prefered_lft = valid_lft;
1723 update_lft = 1;
1724 }
1725 }
1726
1727 if (update_lft) {
1728 ifp->valid_lft = valid_lft;
1729 ifp->prefered_lft = prefered_lft;
1730 ifp->tstamp = now;
1731 flags = ifp->flags;
1732 ifp->flags &= ~IFA_F_DEPRECATED;
1733 spin_unlock(&ifp->lock);
1734
1735 if (!(flags&IFA_F_TENTATIVE))
1736 ipv6_ifa_notify(0, ifp);
1737 } else
1738 spin_unlock(&ifp->lock);
1739
1740#ifdef CONFIG_IPV6_PRIVACY
1741 read_lock_bh(&in6_dev->lock);
1742 /* update all temporary addresses in the list */
1743 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1744 /*
1745 * When adjusting the lifetimes of an existing
1746 * temporary address, only lower the lifetimes.
1747 * Implementations must not increase the
1748 * lifetimes of an existing temporary address
1749 * when processing a Prefix Information Option.
1750 */
1751 spin_lock(&ift->lock);
1752 flags = ift->flags;
1753 if (ift->valid_lft > valid_lft &&
1754 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1755 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1756 if (ift->prefered_lft > prefered_lft &&
1757 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1758 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1759 spin_unlock(&ift->lock);
1760 if (!(flags&IFA_F_TENTATIVE))
1761 ipv6_ifa_notify(0, ift);
1762 }
1763
1764 if (create && in6_dev->cnf.use_tempaddr > 0) {
1765 /*
1766 * When a new public address is created as described in [ADDRCONF],
1767 * also create a new temporary address.
1768 */
1ab1457c 1769 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1770 ipv6_create_tempaddr(ifp, NULL);
1771 } else {
1772 read_unlock_bh(&in6_dev->lock);
1773 }
1774#endif
1775 in6_ifa_put(ifp);
1776 addrconf_verify(0);
1777 }
1778 }
1779 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1780 in6_dev_put(in6_dev);
1781}
1782
1783/*
1784 * Set destination address.
1785 * Special case for SIT interfaces where we create a new "virtual"
1786 * device.
1787 */
1788int addrconf_set_dstaddr(void __user *arg)
1789{
1790 struct in6_ifreq ireq;
1791 struct net_device *dev;
1792 int err = -EINVAL;
1793
1794 rtnl_lock();
1795
1796 err = -EFAULT;
1797 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1798 goto err_exit;
1799
1800 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1801
1802 err = -ENODEV;
1803 if (dev == NULL)
1804 goto err_exit;
1805
0be669bb 1806#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1807 if (dev->type == ARPHRD_SIT) {
1808 struct ifreq ifr;
1809 mm_segment_t oldfs;
1810 struct ip_tunnel_parm p;
1811
1812 err = -EADDRNOTAVAIL;
1813 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1814 goto err_exit;
1815
1816 memset(&p, 0, sizeof(p));
1817 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1818 p.iph.saddr = 0;
1819 p.iph.version = 4;
1820 p.iph.ihl = 5;
1821 p.iph.protocol = IPPROTO_IPV6;
1822 p.iph.ttl = 64;
1823 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1824
1825 oldfs = get_fs(); set_fs(KERNEL_DS);
1826 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1827 set_fs(oldfs);
1828
1829 if (err == 0) {
1830 err = -ENOBUFS;
1831 if ((dev = __dev_get_by_name(p.name)) == NULL)
1832 goto err_exit;
1833 err = dev_open(dev);
1834 }
1835 }
0be669bb 1836#endif
1da177e4
LT		 1837
1838err_exit:
1839 rtnl_unlock();
1840 return err;
1841}
1842
1843/*
1844 * Manual configuration of address on an interface
1845 */
0778769d 1846static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1847 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1848{
1849 struct inet6_ifaddr *ifp;
1850 struct inet6_dev *idev;
1851 struct net_device *dev;
1852 int scope;
46d48046 1853 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1854
1855 ASSERT_RTNL();
1ab1457c 1856
0778769d
NT		 1857 /* check the lifetime */
1858 if (!valid_lft || prefered_lft > valid_lft)
1859 return -EINVAL;
1860
1da177e4
LT		 1861 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1862 return -ENODEV;
1ab1457c 1863
1da177e4
LT		 1864 if ((idev = addrconf_add_dev(dev)) == NULL)
1865 return -ENOBUFS;
1866
1867 scope = ipv6_addr_scope(pfx);
1868
46d48046 1869 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1870 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1871 flags = 0;
1872 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1873 valid_lft = 0x7FFFFFFF/HZ;
1874
1875 if (prefered_lft == 0)
1876 ifa_flags |= IFA_F_DEPRECATED;
1877 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1878 (prefered_lft != INFINITY_LIFE_TIME))
1879 prefered_lft = 0x7FFFFFFF/HZ;
1880
1881 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1882
1da177e4 1883 if (!IS_ERR(ifp)) {
06aebfb7 1884 spin_lock_bh(&ifp->lock);
0778769d
NT		 1885 ifp->valid_lft = valid_lft;
1886 ifp->prefered_lft = prefered_lft;
1887 ifp->tstamp = jiffies;
06aebfb7 1888 spin_unlock_bh(&ifp->lock);
0778769d 1889
46d48046
YH		 1890 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1891 jiffies_to_clock_t(valid_lft * HZ), flags);
1da177e4
LT		 1892 addrconf_dad_start(ifp, 0);
1893 in6_ifa_put(ifp);
0778769d 1894 addrconf_verify(0);
1da177e4
LT		 1895 return 0;
1896 }
1897
1898 return PTR_ERR(ifp);
1899}
1900
1901static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1902{
1903 struct inet6_ifaddr *ifp;
1904 struct inet6_dev *idev;
1905 struct net_device *dev;
1ab1457c 1906
1da177e4
LT		 1907 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1908 return -ENODEV;
1909
1910 if ((idev = __in6_dev_get(dev)) == NULL)
1911 return -ENXIO;
1912
1913 read_lock_bh(&idev->lock);
1914 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1915 if (ifp->prefix_len == plen &&
1916 ipv6_addr_equal(pfx, &ifp->addr)) {
1917 in6_ifa_hold(ifp);
1918 read_unlock_bh(&idev->lock);
1ab1457c 1919
1da177e4
LT		 1920 ipv6_del_addr(ifp);
1921
1922 /* If the last address is deleted administratively,
1923 disable IPv6 on this interface.
1924 */
1925 if (idev->addr_list == NULL)
1926 addrconf_ifdown(idev->dev, 1);
1927 return 0;
1928 }
1929 }
1930 read_unlock_bh(&idev->lock);
1931 return -EADDRNOTAVAIL;
1932}
1933
1934
1935int addrconf_add_ifaddr(void __user *arg)
1936{
1937 struct in6_ifreq ireq;
1938 int err;
1ab1457c 1939
1da177e4
LT		 1940 if (!capable(CAP_NET_ADMIN))
1941 return -EPERM;
1ab1457c 1942
1da177e4
LT		 1943 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1944 return -EFAULT;
1945
1946 rtnl_lock();
0778769d 1947 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 1948 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1949 rtnl_unlock();
1950 return err;
1951}
1952
1953int addrconf_del_ifaddr(void __user *arg)
1954{
1955 struct in6_ifreq ireq;
1956 int err;
1ab1457c 1957
1da177e4
LT		 1958 if (!capable(CAP_NET_ADMIN))
1959 return -EPERM;
1960
1961 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1962 return -EFAULT;
1963
1964 rtnl_lock();
1965 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1966 rtnl_unlock();
1967 return err;
1968}
1969
0be669bb 1970#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1971static void sit_add_v4_addrs(struct inet6_dev *idev)
1972{
1973 struct inet6_ifaddr * ifp;
1974 struct in6_addr addr;
1975 struct net_device *dev;
1976 int scope;
1977
1978 ASSERT_RTNL();
1979
1980 memset(&addr, 0, sizeof(struct in6_addr));
1981 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1982
1983 if (idev->dev->flags&IFF_POINTOPOINT) {
1984 addr.s6_addr32[0] = htonl(0xfe800000);
1985 scope = IFA_LINK;
1986 } else {
1987 scope = IPV6_ADDR_COMPATv4;
1988 }
1989
1990 if (addr.s6_addr32[3]) {
1991 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1992 if (!IS_ERR(ifp)) {
1993 spin_lock_bh(&ifp->lock);
1994 ifp->flags &= ~IFA_F_TENTATIVE;
1995 spin_unlock_bh(&ifp->lock);
1996 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1997 in6_ifa_put(ifp);
1998 }
1999 return;
2000 }
2001
1ab1457c 2002 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 2003 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2004 if (in_dev && (dev->flags & IFF_UP)) {
2005 struct in_ifaddr * ifa;
2006
2007 int flag = scope;
2008
2009 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2010 int plen;
2011
2012 addr.s6_addr32[3] = ifa->ifa_local;
2013
2014 if (ifa->ifa_scope == RT_SCOPE_LINK)
2015 continue;
2016 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2017 if (idev->dev->flags&IFF_POINTOPOINT)
2018 continue;
2019 flag |= IFA_HOST;
2020 }
2021 if (idev->dev->flags&IFF_POINTOPOINT)
2022 plen = 64;
2023 else
2024 plen = 96;
2025
2026 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2027 IFA_F_PERMANENT);
2028 if (!IS_ERR(ifp)) {
2029 spin_lock_bh(&ifp->lock);
2030 ifp->flags &= ~IFA_F_TENTATIVE;
2031 spin_unlock_bh(&ifp->lock);
2032 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2033 in6_ifa_put(ifp);
2034 }
2035 }
2036 }
1ab1457c 2037 }
1da177e4 2038}
0be669bb 2039#endif
1da177e4
LT		 2040
2041static void init_loopback(struct net_device *dev)
2042{
2043 struct inet6_dev *idev;
2044 struct inet6_ifaddr * ifp;
2045
2046 /* ::1 */
2047
2048 ASSERT_RTNL();
2049
2050 if ((idev = ipv6_find_idev(dev)) == NULL) {
2051 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2052 return;
2053 }
2054
2055 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2056 if (!IS_ERR(ifp)) {
2057 spin_lock_bh(&ifp->lock);
2058 ifp->flags &= ~IFA_F_TENTATIVE;
2059 spin_unlock_bh(&ifp->lock);
2060 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2061 in6_ifa_put(ifp);
2062 }
2063}
2064
2065static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2066{
2067 struct inet6_ifaddr * ifp;
2068
2069 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2070 if (!IS_ERR(ifp)) {
46d48046 2071 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2072 addrconf_dad_start(ifp, 0);
2073 in6_ifa_put(ifp);
2074 }
2075}
2076
2077static void addrconf_dev_config(struct net_device *dev)
2078{
2079 struct in6_addr addr;
2080 struct inet6_dev * idev;
2081
2082 ASSERT_RTNL();
2083
1ab1457c 2084 if ((dev->type != ARPHRD_ETHER) &&
1da177e4
LT		 2085 (dev->type != ARPHRD_FDDI) &&
2086 (dev->type != ARPHRD_IEEE802_TR) &&
2087 (dev->type != ARPHRD_ARCNET) &&
2088 (dev->type != ARPHRD_INFINIBAND)) {
2089 /* Alas, we support only Ethernet autoconfiguration. */
2090 return;
2091 }
2092
2093 idev = addrconf_add_dev(dev);
2094 if (idev == NULL)
2095 return;
2096
2097 memset(&addr, 0, sizeof(struct in6_addr));
2098 addr.s6_addr32[0] = htonl(0xFE800000);
2099
2100 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2101 addrconf_add_linklocal(idev, &addr);
2102}
2103
0be669bb 2104#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2105static void addrconf_sit_config(struct net_device *dev)
2106{
2107 struct inet6_dev *idev;
2108
2109 ASSERT_RTNL();
2110
1ab1457c
YH		 2111 /*
2112 * Configure the tunnel with one of our IPv4
2113 * addresses... we should configure all of
1da177e4
LT		 2114 * our v4 addrs in the tunnel
2115 */
2116
2117 if ((idev = ipv6_find_idev(dev)) == NULL) {
2118 printk(KERN_DEBUG "init sit: add_dev failed\n");
2119 return;
2120 }
2121
2122 sit_add_v4_addrs(idev);
2123
2124 if (dev->flags&IFF_POINTOPOINT) {
2125 addrconf_add_mroute(dev);
2126 addrconf_add_lroute(dev);
2127 } else
2128 sit_route_add(dev);
2129}
0be669bb 2130#endif
1da177e4
LT		 2131
2132static inline int
2133ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2134{
2135 struct in6_addr lladdr;
2136
2137 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2138 addrconf_add_linklocal(idev, &lladdr);
2139 return 0;
2140 }
2141 return -1;
2142}
2143
2144static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2145{
2146 struct net_device *link_dev;
2147
2148 /* first try to inherit the link-local address from the link device */
2149 if (idev->dev->iflink &&
2150 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2151 if (!ipv6_inherit_linklocal(idev, link_dev))
2152 return;
2153 }
2154 /* then try to inherit it from any device */
2155 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2156 if (!ipv6_inherit_linklocal(idev, link_dev))
2157 return;
2158 }
2159 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2160}
2161
2162/*
2163 * Autoconfigure tunnel with a link-local address so routing protocols,
2164 * DHCPv6, MLD etc. can be run over the virtual link
2165 */
2166
2167static void addrconf_ip6_tnl_config(struct net_device *dev)
2168{
2169 struct inet6_dev *idev;
2170
2171 ASSERT_RTNL();
2172
2173 if ((idev = addrconf_add_dev(dev)) == NULL) {
2174 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2175 return;
2176 }
2177 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2178}
2179
1ab1457c 2180static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2181 void * data)
2182{
2183 struct net_device *dev = (struct net_device *) data;
2184 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2185 int run_pending = 0;
1da177e4
LT		 2186
2187 switch(event) {
45ba9dd2
YH		 2188 case NETDEV_REGISTER:
2189 if (!idev) {
2190 idev = ipv6_add_dev(dev);
2191 if (!idev)
2192 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2193 dev->name);
2194 }
2195 break;
1da177e4 2196 case NETDEV_UP:
3c21edbd
YH		 2197 case NETDEV_CHANGE:
2198 if (event == NETDEV_UP) {
2199 if (!netif_carrier_ok(dev)) {
2200 /* device is not ready yet. */
2201 printk(KERN_INFO
2202 "ADDRCONF(NETDEV_UP): %s: "
2203 "link is not ready\n",
2204 dev->name);
2205 break;
2206 }
99081049
KS		 2207
2208 if (idev)
2209 idev->if_flags |= IF_READY;
3c21edbd
YH		 2210 } else {
2211 if (!netif_carrier_ok(dev)) {
2212 /* device is still not ready. */
2213 break;
2214 }
2215
2216 if (idev) {
2217 if (idev->if_flags & IF_READY) {
2218 /* device is already configured. */
2219 break;
2220 }
2221 idev->if_flags |= IF_READY;
2222 }
2223
2224 printk(KERN_INFO
2225 "ADDRCONF(NETDEV_CHANGE): %s: "
2226 "link becomes ready\n",
2227 dev->name);
2228
c5e33bdd 2229 run_pending = 1;
3c21edbd
YH		 2230 }
2231
1da177e4 2232 switch(dev->type) {
0be669bb 2233#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2234 case ARPHRD_SIT:
2235 addrconf_sit_config(dev);
2236 break;
0be669bb 2237#endif
1da177e4
LT		 2238 case ARPHRD_TUNNEL6:
2239 addrconf_ip6_tnl_config(dev);
2240 break;
2241 case ARPHRD_LOOPBACK:
2242 init_loopback(dev);
2243 break;
2244
2245 default:
2246 addrconf_dev_config(dev);
2247 break;
2248 };
2249 if (idev) {
c5e33bdd
YH		 2250 if (run_pending)
2251 addrconf_dad_run(idev);
2252
1da177e4
LT		 2253 /* If the MTU changed during the interface down, when the
2254 interface up, the changed MTU must be reflected in the
2255 idev as well as routers.
2256 */
2257 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2258 rt6_mtu_change(dev, dev->mtu);
2259 idev->cnf.mtu6 = dev->mtu;
2260 }
2261 idev->tstamp = jiffies;
2262 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2263 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2264 stop IPv6 on this interface.
2265 */
2266 if (dev->mtu < IPV6_MIN_MTU)
2267 addrconf_ifdown(dev, event != NETDEV_DOWN);
2268 }
2269 break;
2270
2271 case NETDEV_CHANGEMTU:
2272 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2273 rt6_mtu_change(dev, dev->mtu);
2274 idev->cnf.mtu6 = dev->mtu;
2275 break;
2276 }
2277
2278 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2279
2280 case NETDEV_DOWN:
2281 case NETDEV_UNREGISTER:
2282 /*
2283 * Remove all addresses from this interface.
2284 */
2285 addrconf_ifdown(dev, event != NETDEV_DOWN);
2286 break;
3c21edbd 2287
1da177e4
LT		 2288 case NETDEV_CHANGENAME:
2289#ifdef CONFIG_SYSCTL
2290 if (idev) {
2291 addrconf_sysctl_unregister(&idev->cnf);
2292 neigh_sysctl_unregister(idev->nd_parms);
2293 neigh_sysctl_register(dev, idev->nd_parms,
2294 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2295 &ndisc_ifinfo_sysctl_change,
2296 NULL);
2297 addrconf_sysctl_register(idev, &idev->cnf);
2298 }
2299#endif
2300 break;
2301 };
2302
2303 return NOTIFY_OK;
2304}
2305
2306/*
2307 * addrconf module should be notified of a device going up
2308 */
2309static struct notifier_block ipv6_dev_notf = {
2310 .notifier_call = addrconf_notify,
2311 .priority = 0
2312};
2313
2314static int addrconf_ifdown(struct net_device *dev, int how)
2315{
2316 struct inet6_dev *idev;
2317 struct inet6_ifaddr *ifa, **bifa;
2318 int i;
2319
2320 ASSERT_RTNL();
2321
2322 if (dev == &loopback_dev && how == 1)
2323 how = 0;
2324
2325 rt6_ifdown(dev);
2326 neigh_ifdown(&nd_tbl, dev);
2327
2328 idev = __in6_dev_get(dev);
2329 if (idev == NULL)
2330 return -ENODEV;
2331
2332 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2333 Do not dev_put!
1da177e4
LT		 2334 */
2335 if (how == 1) {
1da177e4 2336 idev->dead = 1;
8814c4b5
YH		 2337
2338 /* protected by rtnl_lock */
2339 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2340
2341 /* Step 1.5: remove snmp6 entry */
2342 snmp6_unregister_dev(idev);
2343
2344 }
2345
2346 /* Step 2: clear hash table */
2347 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2348 bifa = &inet6_addr_lst[i];
2349
2350 write_lock_bh(&addrconf_hash_lock);
2351 while ((ifa = *bifa) != NULL) {
2352 if (ifa->idev == idev) {
2353 *bifa = ifa->lst_next;
2354 ifa->lst_next = NULL;
2355 addrconf_del_timer(ifa);
2356 in6_ifa_put(ifa);
2357 continue;
2358 }
2359 bifa = &ifa->lst_next;
2360 }
2361 write_unlock_bh(&addrconf_hash_lock);
2362 }
2363
2364 write_lock_bh(&idev->lock);
2365
2366 /* Step 3: clear flags for stateless addrconf */
2367 if (how != 1)
3c21edbd 2368 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2369
2370 /* Step 4: clear address list */
2371#ifdef CONFIG_IPV6_PRIVACY
2372 if (how == 1 && del_timer(&idev->regen_timer))
2373 in6_dev_put(idev);
2374
2375 /* clear tempaddr list */
2376 while ((ifa = idev->tempaddr_list) != NULL) {
2377 idev->tempaddr_list = ifa->tmp_next;
2378 ifa->tmp_next = NULL;
2379 ifa->dead = 1;
2380 write_unlock_bh(&idev->lock);
2381 spin_lock_bh(&ifa->lock);
2382
2383 if (ifa->ifpub) {
2384 in6_ifa_put(ifa->ifpub);
2385 ifa->ifpub = NULL;
2386 }
2387 spin_unlock_bh(&ifa->lock);
2388 in6_ifa_put(ifa);
2389 write_lock_bh(&idev->lock);
2390 }
2391#endif
2392 while ((ifa = idev->addr_list) != NULL) {
2393 idev->addr_list = ifa->if_next;
2394 ifa->if_next = NULL;
2395 ifa->dead = 1;
2396 addrconf_del_timer(ifa);
2397 write_unlock_bh(&idev->lock);
2398
2399 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2400 in6_ifa_put(ifa);
2401
2402 write_lock_bh(&idev->lock);
2403 }
2404 write_unlock_bh(&idev->lock);
2405
2406 /* Step 5: Discard multicast list */
2407
2408 if (how == 1)
2409 ipv6_mc_destroy_dev(idev);
2410 else
2411 ipv6_mc_down(idev);
2412
2413 /* Step 5: netlink notification of this interface */
2414 idev->tstamp = jiffies;
979ad663 2415 inet6_ifinfo_notify(RTM_DELLINK, idev);
1ab1457c 2416
1da177e4
LT		 2417 /* Shot the device (if unregistered) */
2418
2419 if (how == 1) {
2420#ifdef CONFIG_SYSCTL
2421 addrconf_sysctl_unregister(&idev->cnf);
2422 neigh_sysctl_unregister(idev->nd_parms);
2423#endif
2424 neigh_parms_release(&nd_tbl, idev->nd_parms);
2425 neigh_ifdown(&nd_tbl, dev);
2426 in6_dev_put(idev);
2427 }
2428 return 0;
2429}
2430
2431static void addrconf_rs_timer(unsigned long data)
2432{
2433 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2434
2435 if (ifp->idev->cnf.forwarding)
2436 goto out;
2437
2438 if (ifp->idev->if_flags & IF_RA_RCVD) {
2439 /*
2440 * Announcement received after solicitation
2441 * was sent
2442 */
2443 goto out;
2444 }
2445
2446 spin_lock(&ifp->lock);
2447 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2448 struct in6_addr all_routers;
2449
2450 /* The wait after the last probe can be shorter */
2451 addrconf_mod_timer(ifp, AC_RS,
2452 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2453 ifp->idev->cnf.rtr_solicit_delay :
2454 ifp->idev->cnf.rtr_solicit_interval);
2455 spin_unlock(&ifp->lock);
2456
2457 ipv6_addr_all_routers(&all_routers);
2458
2459 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2460 } else {
2461 spin_unlock(&ifp->lock);
2462 /*
2463 * Note: we do not support deprecated "all on-link"
2464 * assumption any longer.
2465 */
2466 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2467 ifp->idev->dev->name);
2468 }
2469
2470out:
2471 in6_ifa_put(ifp);
2472}
2473
2474/*
2475 * Duplicate Address Detection
2476 */
3c21edbd
YH		 2477static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2478{
2479 unsigned long rand_num;
2480 struct inet6_dev *idev = ifp->idev;
2481
2482 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2483 ifp->probes = idev->cnf.dad_transmits;
2484 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2485}
2486
e431b8c0 2487static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2488{
2489 struct inet6_dev *idev = ifp->idev;
2490 struct net_device *dev = idev->dev;
1da177e4
LT		 2491
2492 addrconf_join_solict(dev, &ifp->addr);
2493
1da177e4 2494 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2495
2496 read_lock_bh(&idev->lock);
2497 if (ifp->dead)
2498 goto out;
2499 spin_lock_bh(&ifp->lock);
2500
2501 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2502 !(ifp->flags&IFA_F_TENTATIVE) ||
2503 ifp->flags & IFA_F_NODAD) {
1da177e4
LT		 2504 ifp->flags &= ~IFA_F_TENTATIVE;
2505 spin_unlock_bh(&ifp->lock);
2506 read_unlock_bh(&idev->lock);
2507
2508 addrconf_dad_completed(ifp);
2509 return;
2510 }
2511
6732bade 2512 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2513 spin_unlock_bh(&ifp->lock);
6732bade 2514 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2515 /*
2516 * If the defice is not ready:
2517 * - keep it tentative if it is a permanent address.
2518 * - otherwise, kill it.
2519 */
2520 in6_ifa_hold(ifp);
2521 addrconf_dad_stop(ifp);
6732bade 2522 return;
3c21edbd 2523 }
6732bade
YH		 2524 addrconf_dad_kick(ifp);
2525 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2526out:
2527 read_unlock_bh(&idev->lock);
2528}
2529
2530static void addrconf_dad_timer(unsigned long data)
2531{
2532 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2533 struct inet6_dev *idev = ifp->idev;
2534 struct in6_addr unspec;
2535 struct in6_addr mcaddr;
2536
2537 read_lock_bh(&idev->lock);
2538 if (idev->dead) {
2539 read_unlock_bh(&idev->lock);
2540 goto out;
2541 }
2542 spin_lock_bh(&ifp->lock);
2543 if (ifp->probes == 0) {
2544 /*
2545 * DAD was successful
2546 */
2547
2548 ifp->flags &= ~IFA_F_TENTATIVE;
2549 spin_unlock_bh(&ifp->lock);
2550 read_unlock_bh(&idev->lock);
2551
2552 addrconf_dad_completed(ifp);
2553
2554 goto out;
2555 }
2556
2557 ifp->probes--;
2558 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2559 spin_unlock_bh(&ifp->lock);
2560 read_unlock_bh(&idev->lock);
2561
2562 /* send a neighbour solicitation for our addr */
2563 memset(&unspec, 0, sizeof(unspec));
2564 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2565 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2566out:
2567 in6_ifa_put(ifp);
2568}
2569
2570static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2571{
2572 struct net_device * dev = ifp->idev->dev;
2573
2574 /*
2575 * Configure the address for reception. Now it is valid.
2576 */
2577
2578 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2579
2580 /* If added prefix is link local and forwarding is off,
2581 start sending router solicitations.
2582 */
2583
2584 if (ifp->idev->cnf.forwarding == 0 &&
2585 ifp->idev->cnf.rtr_solicits > 0 &&
2586 (dev->flags&IFF_LOOPBACK) == 0 &&
2587 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2588 struct in6_addr all_routers;
2589
2590 ipv6_addr_all_routers(&all_routers);
2591
2592 /*
2593 * If a host as already performed a random delay
2594 * [...] as part of DAD [...] there is no need
2595 * to delay again before sending the first RS
2596 */
2597 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2598
2599 spin_lock_bh(&ifp->lock);
2600 ifp->probes = 1;
2601 ifp->idev->if_flags |= IF_RS_SENT;
2602 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2603 spin_unlock_bh(&ifp->lock);
2604 }
2605}
2606
c5e33bdd
YH		 2607static void addrconf_dad_run(struct inet6_dev *idev) {
2608 struct inet6_ifaddr *ifp;
2609
2610 read_lock_bh(&idev->lock);
2611 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2612 spin_lock_bh(&ifp->lock);
2613 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2614 spin_unlock_bh(&ifp->lock);
2615 continue;
2616 }
2617 spin_unlock_bh(&ifp->lock);
2618 addrconf_dad_kick(ifp);
2619 }
2620 read_unlock_bh(&idev->lock);
2621}
2622
1da177e4
LT		 2623#ifdef CONFIG_PROC_FS
2624struct if6_iter_state {
2625 int bucket;
2626};
2627
2628static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2629{
2630 struct inet6_ifaddr *ifa = NULL;
2631 struct if6_iter_state *state = seq->private;
2632
2633 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2634 ifa = inet6_addr_lst[state->bucket];
2635 if (ifa)
2636 break;
2637 }
2638 return ifa;
2639}
2640
2641static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2642{
2643 struct if6_iter_state *state = seq->private;
2644
2645 ifa = ifa->lst_next;
2646try_again:
2647 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2648 ifa = inet6_addr_lst[state->bucket];
2649 goto try_again;
2650 }
2651 return ifa;
2652}
2653
2654static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2655{
2656 struct inet6_ifaddr *ifa = if6_get_first(seq);
2657
2658 if (ifa)
2659 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2660 --pos;
2661 return pos ? NULL : ifa;
2662}
2663
2664static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2665{
2666 read_lock_bh(&addrconf_hash_lock);
2667 return if6_get_idx(seq, *pos);
2668}
2669
2670static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2671{
2672 struct inet6_ifaddr *ifa;
2673
2674 ifa = if6_get_next(seq, v);
2675 ++*pos;
2676 return ifa;
2677}
2678
2679static void if6_seq_stop(struct seq_file *seq, void *v)
2680{
2681 read_unlock_bh(&addrconf_hash_lock);
2682}
2683
2684static int if6_seq_show(struct seq_file *seq, void *v)
2685{
2686 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2687 seq_printf(seq,
9343e79a 2688 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2689 NIP6(ifp->addr),
2690 ifp->idev->dev->ifindex,
2691 ifp->prefix_len,
2692 ifp->scope,
2693 ifp->flags,
2694 ifp->idev->dev->name);
2695 return 0;
2696}
2697
2698static struct seq_operations if6_seq_ops = {
2699 .start = if6_seq_start,
2700 .next = if6_seq_next,
2701 .show = if6_seq_show,
2702 .stop = if6_seq_stop,
2703};
2704
2705static int if6_seq_open(struct inode *inode, struct file *file)
2706{
2707 struct seq_file *seq;
2708 int rc = -ENOMEM;
322f74a4 2709 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2710
2711 if (!s)
2712 goto out;
1da177e4
LT		 2713
2714 rc = seq_open(file, &if6_seq_ops);
2715 if (rc)
2716 goto out_kfree;
2717
2718 seq = file->private_data;
2719 seq->private = s;
2720out:
2721 return rc;
2722out_kfree:
2723 kfree(s);
2724 goto out;
2725}
2726
9a32144e 2727static const struct file_operations if6_fops = {
1da177e4
LT		 2728 .owner = THIS_MODULE,
2729 .open = if6_seq_open,
2730 .read = seq_read,
2731 .llseek = seq_lseek,
2732 .release = seq_release_private,
2733};
2734
2735int __init if6_proc_init(void)
2736{
2737 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2738 return -ENOMEM;
2739 return 0;
2740}
2741
2742void if6_proc_exit(void)
2743{
2744 proc_net_remove("if_inet6");
2745}
2746#endif /* CONFIG_PROC_FS */
2747
3b9f9a1c
NT		 2748#ifdef CONFIG_IPV6_MIP6
2749/* Check if address is a home address configured on any interface. */
2750int ipv6_chk_home_addr(struct in6_addr *addr)
2751{
2752 int ret = 0;
2753 struct inet6_ifaddr * ifp;
2754 u8 hash = ipv6_addr_hash(addr);
2755 read_lock_bh(&addrconf_hash_lock);
2756 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2757 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2758 (ifp->flags & IFA_F_HOMEADDRESS)) {
2759 ret = 1;
2760 break;
2761 }
2762 }
2763 read_unlock_bh(&addrconf_hash_lock);
2764 return ret;
2765}
2766#endif
2767
1da177e4
LT		 2768/*
2769 * Periodic address status verification
2770 */
2771
2772static void addrconf_verify(unsigned long foo)
2773{
2774 struct inet6_ifaddr *ifp;
2775 unsigned long now, next;
2776 int i;
2777
2778 spin_lock_bh(&addrconf_verify_lock);
2779 now = jiffies;
2780 next = now + ADDR_CHECK_FREQUENCY;
2781
2782 del_timer(&addr_chk_timer);
2783
2784 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2785
2786restart:
5d5780df 2787 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2788 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2789 unsigned long age;
2790#ifdef CONFIG_IPV6_PRIVACY
2791 unsigned long regen_advance;
2792#endif
2793
2794 if (ifp->flags & IFA_F_PERMANENT)
2795 continue;
2796
2797 spin_lock(&ifp->lock);
2798 age = (now - ifp->tstamp) / HZ;
2799
2800#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2801 regen_advance = ifp->idev->cnf.regen_max_retry *
2802 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2803 ifp->idev->nd_parms->retrans_time / HZ;
2804#endif
2805
8f27ebb9
YH		 2806 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2807 age >= ifp->valid_lft) {
1da177e4
LT		 2808 spin_unlock(&ifp->lock);
2809 in6_ifa_hold(ifp);
5d5780df 2810 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2811 ipv6_del_addr(ifp);
2812 goto restart;
8f27ebb9
YH		 2813 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2814 spin_unlock(&ifp->lock);
2815 continue;
1da177e4
LT		 2816 } else if (age >= ifp->prefered_lft) {
2817 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2818 int deprecate = 0;
2819
2820 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2821 deprecate = 1;
2822 ifp->flags |= IFA_F_DEPRECATED;
2823 }
2824
2825 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2826 next = ifp->tstamp + ifp->valid_lft * HZ;
2827
2828 spin_unlock(&ifp->lock);
2829
2830 if (deprecate) {
2831 in6_ifa_hold(ifp);
5d5780df 2832 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2833
2834 ipv6_ifa_notify(0, ifp);
2835 in6_ifa_put(ifp);
2836 goto restart;
2837 }
2838#ifdef CONFIG_IPV6_PRIVACY
2839 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2840 !(ifp->flags&IFA_F_TENTATIVE)) {
2841 if (age >= ifp->prefered_lft - regen_advance) {
2842 struct inet6_ifaddr *ifpub = ifp->ifpub;
2843 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2844 next = ifp->tstamp + ifp->prefered_lft * HZ;
2845 if (!ifp->regen_count && ifpub) {
2846 ifp->regen_count++;
2847 in6_ifa_hold(ifp);
2848 in6_ifa_hold(ifpub);
2849 spin_unlock(&ifp->lock);
5d5780df 2850 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2851 spin_lock(&ifpub->lock);
2852 ifpub->regen_count = 0;
2853 spin_unlock(&ifpub->lock);
1da177e4
LT		 2854 ipv6_create_tempaddr(ifpub, ifp);
2855 in6_ifa_put(ifpub);
2856 in6_ifa_put(ifp);
2857 goto restart;
2858 }
2859 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2860 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2861 spin_unlock(&ifp->lock);
2862#endif
2863 } else {
2864 /* ifp->prefered_lft <= ifp->valid_lft */
2865 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2866 next = ifp->tstamp + ifp->prefered_lft * HZ;
2867 spin_unlock(&ifp->lock);
2868 }
2869 }
5d5780df 2870 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2871 }
2872
2873 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2874 add_timer(&addr_chk_timer);
2875 spin_unlock_bh(&addrconf_verify_lock);
2876}
2877
461d8837
TG		 2878static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2879{
2880 struct in6_addr *pfx = NULL;
2881
2882 if (addr)
2883 pfx = nla_data(addr);
2884
2885 if (local) {
2886 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2887 pfx = NULL;
2888 else
2889 pfx = nla_data(local);
2890 }
2891
2892 return pfx;
2893}
2894
2895static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2896 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2897 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2898 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2899};
2900
1da177e4
LT		 2901static int
2902inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2903{
b933f716
TG		 2904 struct ifaddrmsg *ifm;
2905 struct nlattr *tb[IFA_MAX+1];
1da177e4 2906 struct in6_addr *pfx;
b933f716 2907 int err;
1da177e4 2908
b933f716
TG		 2909 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2910 if (err < 0)
2911 return err;
2912
2913 ifm = nlmsg_data(nlh);
2914 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 2915 if (pfx == NULL)
2916 return -EINVAL;
2917
2918 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2919}
2920
55ebaef1
NT		 2921static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2922 u32 prefered_lft, u32 valid_lft)
081bba5b 2923{
46d48046
YH		 2924 u32 flags = RTF_EXPIRES;
2925
081bba5b
NT		 2926 if (!valid_lft || (prefered_lft > valid_lft))
2927 return -EINVAL;
2928
46d48046 2929 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 2930 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 2931 flags = 0;
2932 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 2933 valid_lft = 0x7FFFFFFF/HZ;
2934
2935 if (prefered_lft == 0)
55ebaef1 2936 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 2937 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2938 (prefered_lft != INFINITY_LIFE_TIME))
2939 prefered_lft = 0x7FFFFFFF/HZ;
2940
2941 spin_lock_bh(&ifp->lock);
3b9f9a1c 2942 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 2943 ifp->tstamp = jiffies;
2944 ifp->valid_lft = valid_lft;
2945 ifp->prefered_lft = prefered_lft;
2946
2947 spin_unlock_bh(&ifp->lock);
2948 if (!(ifp->flags&IFA_F_TENTATIVE))
2949 ipv6_ifa_notify(0, ifp);
081bba5b 2950
46d48046
YH		 2951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
2952 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 2953 addrconf_verify(0);
2954
2955 return 0;
2956}
2957
1da177e4
LT		 2958static int
2959inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2960{
461d8837
TG		 2961 struct ifaddrmsg *ifm;
2962 struct nlattr *tb[IFA_MAX+1];
1da177e4 2963 struct in6_addr *pfx;
7198f8ce
TG		 2964 struct inet6_ifaddr *ifa;
2965 struct net_device *dev;
55ebaef1
NT		 2966 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2967 u8 ifa_flags;
461d8837 2968 int err;
1da177e4 2969
461d8837
TG		 2970 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2971 if (err < 0)
2972 return err;
2973
2974 ifm = nlmsg_data(nlh);
2975 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 2976 if (pfx == NULL)
2977 return -EINVAL;
2978
461d8837 2979 if (tb[IFA_CACHEINFO]) {
0778769d 2980 struct ifa_cacheinfo *ci;
461d8837
TG		 2981
2982 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 2983 valid_lft = ci->ifa_valid;
461d8837
TG		 2984 preferred_lft = ci->ifa_prefered;
2985 } else {
2986 preferred_lft = INFINITY_LIFE_TIME;
2987 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 2988 }
2989
7198f8ce
TG		 2990 dev = __dev_get_by_index(ifm->ifa_index);
2991 if (dev == NULL)
2992 return -ENODEV;
2993
55ebaef1 2994 /* We ignore other flags so far. */
3b9f9a1c 2995 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 2996
7198f8ce
TG		 2997 ifa = ipv6_get_ifaddr(pfx, dev, 1);
2998 if (ifa == NULL) {
2999 /*
3000 * It would be best to check for !NLM_F_CREATE here but
3001 * userspace alreay relies on not having to provide this.
3002 */
3003 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3004 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3005 }
3006
7198f8ce
TG		 3007 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3008 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3009 err = -EEXIST;
3010 else
55ebaef1 3011 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3012
3013 in6_ifa_put(ifa);
3014
3015 return err;
1da177e4
LT		 3016}
3017
101bb229
TG		 3018static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3019 u8 scope, int ifindex)
3020{
3021 struct ifaddrmsg *ifm;
3022
3023 ifm = nlmsg_data(nlh);
3024 ifm->ifa_family = AF_INET6;
3025 ifm->ifa_prefixlen = prefixlen;
3026 ifm->ifa_flags = flags;
3027 ifm->ifa_scope = scope;
3028 ifm->ifa_index = ifindex;
3029}
3030
85486af0
TG		 3031static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3032 unsigned long tstamp, u32 preferred, u32 valid)
3033{
3034 struct ifa_cacheinfo ci;
3035
3036 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3037 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3038 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3039 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3040 ci.ifa_prefered = preferred;
3041 ci.ifa_valid = valid;
3042
3043 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3044}
3045
101bb229
TG		 3046static inline int rt_scope(int ifa_scope)
3047{
3048 if (ifa_scope & IFA_HOST)
3049 return RT_SCOPE_HOST;
3050 else if (ifa_scope & IFA_LINK)
3051 return RT_SCOPE_LINK;
3052 else if (ifa_scope & IFA_SITE)
3053 return RT_SCOPE_SITE;
3054 else
3055 return RT_SCOPE_UNIVERSE;
3056}
3057
0ab6803b
TG		 3058static inline int inet6_ifaddr_msgsize(void)
3059{
339bf98f
TG		 3060 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3061 + nla_total_size(16) /* IFA_ADDRESS */
3062 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3063}
c5396a31 3064
1da177e4 3065static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3066 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3067{
1da177e4 3068 struct nlmsghdr *nlh;
85486af0 3069 u32 preferred, valid;
1da177e4 3070
0ab6803b
TG		 3071 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3072 if (nlh == NULL)
26932566 3073 return -EMSGSIZE;
0ab6803b 3074
101bb229
TG		 3075 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3076 ifa->idev->dev->ifindex);
3077
1da177e4 3078 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3079 preferred = ifa->prefered_lft;
3080 valid = ifa->valid_lft;
3081 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3082 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3083 preferred -= tval;
3084 if (valid != INFINITY_LIFE_TIME)
3085 valid -= tval;
1da177e4
LT		 3086 }
3087 } else {
85486af0
TG		 3088 preferred = INFINITY_LIFE_TIME;
3089 valid = INFINITY_LIFE_TIME;
3090 }
3091
0ab6803b 3092 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3093 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3094 nlmsg_cancel(skb, nlh);
3095 return -EMSGSIZE;
3096 }
1da177e4 3097
0ab6803b 3098 return nlmsg_end(skb, nlh);
1da177e4
LT		 3099}
3100
3101static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3102 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3103{
1da177e4 3104 struct nlmsghdr *nlh;
101bb229
TG		 3105 u8 scope = RT_SCOPE_UNIVERSE;
3106 int ifindex = ifmca->idev->dev->ifindex;
3107
3108 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3109 scope = RT_SCOPE_SITE;
1da177e4 3110
0ab6803b
TG		 3111 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3112 if (nlh == NULL)
26932566 3113 return -EMSGSIZE;
85486af0 3114
0ab6803b
TG		 3115 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3116 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3117 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3118 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3119 nlmsg_cancel(skb, nlh);
3120 return -EMSGSIZE;
3121 }
85486af0 3122
0ab6803b 3123 return nlmsg_end(skb, nlh);
1da177e4
LT		 3124}
3125
3126static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3127 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3128{
1da177e4 3129 struct nlmsghdr *nlh;
101bb229
TG		 3130 u8 scope = RT_SCOPE_UNIVERSE;
3131 int ifindex = ifaca->aca_idev->dev->ifindex;
3132
3133 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3134 scope = RT_SCOPE_SITE;
1da177e4 3135
0ab6803b
TG		 3136 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3137 if (nlh == NULL)
26932566 3138 return -EMSGSIZE;
85486af0 3139
0ab6803b
TG		 3140 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3141 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3142 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3143 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3144 nlmsg_cancel(skb, nlh);
3145 return -EMSGSIZE;
3146 }
1da177e4 3147
0ab6803b 3148 return nlmsg_end(skb, nlh);
1da177e4
LT		 3149}
3150
3151enum addr_type_t
3152{
3153 UNICAST_ADDR,
3154 MULTICAST_ADDR,
3155 ANYCAST_ADDR,
3156};
3157
3158static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3159 enum addr_type_t type)
3160{
3161 int idx, ip_idx;
3162 int s_idx, s_ip_idx;
3163 int err = 1;
3164 struct net_device *dev;
3165 struct inet6_dev *idev = NULL;
3166 struct inet6_ifaddr *ifa;
3167 struct ifmcaddr6 *ifmca;
3168 struct ifacaddr6 *ifaca;
3169
3170 s_idx = cb->args[0];
3171 s_ip_idx = ip_idx = cb->args[1];
3172 read_lock(&dev_base_lock);
1ab1457c 3173
1da177e4
LT		 3174 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3175 if (idx < s_idx)
3176 continue;
3177 if (idx > s_idx)
3178 s_ip_idx = 0;
3179 ip_idx = 0;
3180 if ((idev = in6_dev_get(dev)) == NULL)
3181 continue;
3182 read_lock_bh(&idev->lock);
3183 switch (type) {
3184 case UNICAST_ADDR:
ae9cda5d 3185 /* unicast address incl. temp addr */
1da177e4
LT		 3186 for (ifa = idev->addr_list; ifa;
3187 ifa = ifa->if_next, ip_idx++) {
3188 if (ip_idx < s_ip_idx)
3189 continue;
1ab1457c
YH		 3190 if ((err = inet6_fill_ifaddr(skb, ifa,
3191 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3192 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3193 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3194 goto done;
3195 }
1da177e4
LT		 3196 break;
3197 case MULTICAST_ADDR:
3198 /* multicast address */
1ab1457c 3199 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3200 ifmca = ifmca->next, ip_idx++) {
3201 if (ip_idx < s_ip_idx)
3202 continue;
1ab1457c
YH		 3203 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3204 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3205 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3206 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3207 goto done;
3208 }
3209 break;
3210 case ANYCAST_ADDR:
3211 /* anycast address */
3212 for (ifaca = idev->ac_list; ifaca;
3213 ifaca = ifaca->aca_next, ip_idx++) {
3214 if (ip_idx < s_ip_idx)
3215 continue;
1ab1457c
YH		 3216 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3217 NETLINK_CB(cb->skb).pid,
b6544c0b 3218 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3219 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3220 goto done;
3221 }
3222 break;
3223 default:
3224 break;
3225 }
3226 read_unlock_bh(&idev->lock);
3227 in6_dev_put(idev);
3228 }
3229done:
3230 if (err <= 0) {
3231 read_unlock_bh(&idev->lock);
3232 in6_dev_put(idev);
3233 }
3234 read_unlock(&dev_base_lock);
3235 cb->args[0] = idx;
3236 cb->args[1] = ip_idx;
3237 return skb->len;
3238}
3239
3240static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3241{
3242 enum addr_type_t type = UNICAST_ADDR;
3243 return inet6_dump_addr(skb, cb, type);
3244}
3245
3246static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3247{
3248 enum addr_type_t type = MULTICAST_ADDR;
3249 return inet6_dump_addr(skb, cb, type);
3250}
3251
3252
3253static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3254{
3255 enum addr_type_t type = ANYCAST_ADDR;
3256 return inet6_dump_addr(skb, cb, type);
3257}
3258
1b29fc2c
TG		 3259static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3260 void *arg)
6c223828 3261{
1b29fc2c
TG		 3262 struct ifaddrmsg *ifm;
3263 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3264 struct in6_addr *addr = NULL;
3265 struct net_device *dev = NULL;
3266 struct inet6_ifaddr *ifa;
3267 struct sk_buff *skb;
6c223828
NT		 3268 int err;
3269
1b29fc2c
TG		 3270 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3271 if (err < 0)
3272 goto errout;
3273
3274 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3275 if (addr == NULL) {
3276 err = -EINVAL;
3277 goto errout;
6c223828 3278 }
6c223828 3279
1b29fc2c 3280 ifm = nlmsg_data(nlh);
6c223828
NT		 3281 if (ifm->ifa_index)
3282 dev = __dev_get_by_index(ifm->ifa_index);
3283
1b29fc2c
TG		 3284 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3285 err = -EADDRNOTAVAIL;
3286 goto errout;
3287 }
6c223828 3288
0ab6803b 3289 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3290 err = -ENOBUFS;
1b29fc2c 3291 goto errout_ifa;
6c223828
NT		 3292 }
3293
6c223828
NT		 3294 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3295 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3296 if (err < 0) {
3297 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3298 WARN_ON(err == -EMSGSIZE);
3299 kfree_skb(skb);
3300 goto errout_ifa;
3301 }
2942e900 3302 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3303errout_ifa:
6c223828 3304 in6_ifa_put(ifa);
1b29fc2c 3305errout:
6c223828 3306 return err;
6c223828
NT		 3307}
3308
1da177e4
LT		 3309static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3310{
3311 struct sk_buff *skb;
5d620266 3312 int err = -ENOBUFS;
1da177e4 3313
0ab6803b 3314 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3315 if (skb == NULL)
3316 goto errout;
3317
3318 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3319 if (err < 0) {
3320 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3321 WARN_ON(err == -EMSGSIZE);
3322 kfree_skb(skb);
3323 goto errout;
3324 }
5d620266
TG		 3325 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3326errout:
3327 if (err < 0)
3328 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3329}
3330
b6f99a21 3331static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3332 __s32 *array, int bytes)
3333{
04561c1f
TG		 3334 BUG_ON(bytes < (DEVCONF_MAX * 4));
3335
1da177e4
LT		 3336 memset(array, 0, bytes);
3337 array[DEVCONF_FORWARDING] = cnf->forwarding;
3338 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3339 array[DEVCONF_MTU6] = cnf->mtu6;
3340 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3341 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3342 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3343 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3344 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3345 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3346 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3347 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3348#ifdef CONFIG_IPV6_PRIVACY
3349 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3350 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3351 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3352 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3353 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3354#endif
3355 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3356 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3357 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3358#ifdef CONFIG_IPV6_ROUTER_PREF
3359 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3360 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3361#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3362 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3363#endif
930d6ff2 3364#endif
fbea49e1 3365 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3366 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
1da177e4
LT		 3367}
3368
339bf98f
TG		 3369static inline size_t inet6_if_nlmsg_size(void)
3370{
3371 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3372 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3373 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3374 + nla_total_size(4) /* IFLA_MTU */
3375 + nla_total_size(4) /* IFLA_LINK */
3376 + nla_total_size( /* IFLA_PROTINFO */
3377 nla_total_size(4) /* IFLA_INET6_FLAGS */
3378 + nla_total_size(sizeof(struct ifla_cacheinfo))
3379 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3380 );
3381}
c5396a31 3382
1ab1457c 3383static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3384 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3385{
04561c1f
TG		 3386 struct net_device *dev = idev->dev;
3387 struct nlattr *conf;
3388 struct ifinfomsg *hdr;
3389 struct nlmsghdr *nlh;
3390 void *protoinfo;
3391 struct ifla_cacheinfo ci;
3392
3393 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3394 if (nlh == NULL)
26932566 3395 return -EMSGSIZE;
04561c1f
TG		 3396
3397 hdr = nlmsg_data(nlh);
3398 hdr->ifi_family = AF_INET6;
3399 hdr->__ifi_pad = 0;
3400 hdr->ifi_type = dev->type;
3401 hdr->ifi_index = dev->ifindex;
3402 hdr->ifi_flags = dev_get_flags(dev);
3403 hdr->ifi_change = 0;
3404
3405 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3406
3407 if (dev->addr_len)
04561c1f 3408 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3409
04561c1f 3410 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3411 if (dev->ifindex != dev->iflink)
04561c1f 3412 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3413
04561c1f
TG		 3414 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3415 if (protoinfo == NULL)
3416 goto nla_put_failure;
1da177e4 3417
04561c1f 3418 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3419
1da177e4
LT		 3420 ci.max_reasm_len = IPV6_MAXPLEN;
3421 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3422 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3423 ci.reachable_time = idev->nd_parms->reachable_time;
3424 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3425 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3426
3427 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3428 if (conf == NULL)
3429 goto nla_put_failure;
3430 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
1da177e4
LT		 3431
3432 /* XXX - Statistics/MC not implemented */
1da177e4 3433
04561c1f
TG		 3434 nla_nest_end(skb, protoinfo);
3435 return nlmsg_end(skb, nlh);
1da177e4 3436
04561c1f 3437nla_put_failure:
26932566
PM		 3438 nlmsg_cancel(skb, nlh);
3439 return -EMSGSIZE;
1da177e4
LT		 3440}
3441
3442static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3443{
3444 int idx, err;
3445 int s_idx = cb->args[0];
3446 struct net_device *dev;
3447 struct inet6_dev *idev;
3448
3449 read_lock(&dev_base_lock);
3450 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3451 if (idx < s_idx)
3452 continue;
3453 if ((idev = in6_dev_get(dev)) == NULL)
3454 continue;
1ab1457c 3455 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3456 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3457 in6_dev_put(idev);
3458 if (err <= 0)
3459 break;
3460 }
3461 read_unlock(&dev_base_lock);
3462 cb->args[0] = idx;
3463
3464 return skb->len;
3465}
3466
3467void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3468{
3469 struct sk_buff *skb;
8d7a76c9 3470 int err = -ENOBUFS;
1ab1457c 3471
339bf98f 3472 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3473 if (skb == NULL)
3474 goto errout;
3475
3476 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3477 if (err < 0) {
3478 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3479 WARN_ON(err == -EMSGSIZE);
3480 kfree_skb(skb);
3481 goto errout;
3482 }
8d7a76c9
TG		 3483 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3484errout:
3485 if (err < 0)
3486 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3487}
3488
339bf98f
TG		 3489static inline size_t inet6_prefix_nlmsg_size(void)
3490{
3491 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3492 + nla_total_size(sizeof(struct in6_addr))
3493 + nla_total_size(sizeof(struct prefix_cacheinfo));
3494}
c5396a31 3495
1da177e4 3496static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3497 struct prefix_info *pinfo, u32 pid, u32 seq,
3498 int event, unsigned int flags)
1da177e4 3499{
6051e2f4
TG		 3500 struct prefixmsg *pmsg;
3501 struct nlmsghdr *nlh;
1da177e4
LT		 3502 struct prefix_cacheinfo ci;
3503
6051e2f4
TG		 3504 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3505 if (nlh == NULL)
26932566 3506 return -EMSGSIZE;
6051e2f4
TG		 3507
3508 pmsg = nlmsg_data(nlh);
1da177e4 3509 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3510 pmsg->prefix_pad1 = 0;
3511 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3512 pmsg->prefix_ifindex = idev->dev->ifindex;
3513 pmsg->prefix_len = pinfo->prefix_len;
3514 pmsg->prefix_type = pinfo->type;
8a47077a 3515 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3516 pmsg->prefix_flags = 0;
3517 if (pinfo->onlink)
3518 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3519 if (pinfo->autoconf)
3520 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3521
6051e2f4 3522 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3523
3524 ci.preferred_time = ntohl(pinfo->prefered);
3525 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3526 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3527
6051e2f4 3528 return nlmsg_end(skb, nlh);
1da177e4 3529
6051e2f4 3530nla_put_failure:
26932566
PM		 3531 nlmsg_cancel(skb, nlh);
3532 return -EMSGSIZE;
1da177e4
LT		 3533}
3534
1ab1457c 3535static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3536 struct prefix_info *pinfo)
3537{
3538 struct sk_buff *skb;
8c384bfa 3539 int err = -ENOBUFS;
1da177e4 3540
339bf98f 3541 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3542 if (skb == NULL)
3543 goto errout;
3544
3545 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3546 if (err < 0) {
3547 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3548 WARN_ON(err == -EMSGSIZE);
3549 kfree_skb(skb);
3550 goto errout;
3551 }
8c384bfa
TG		 3552 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3553errout:
3554 if (err < 0)
3555 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3556}
3557
db46edc6 3558static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
1da177e4
LT		 3559 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3560 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3561 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
6c223828
NT		 3562 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3563 .dumpit = inet6_dump_ifaddr, },
1da177e4
LT		 3564 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3565 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3566 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3567 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3568 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3569 .dumpit = inet6_dump_fib, },
8423a9aa 3570#ifdef CONFIG_IPV6_MULTIPLE_TABLES
101367c2 3571 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
8423a9aa 3572#endif
1da177e4
LT		 3573};
3574
3575static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3576{
3577 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3578
3579 switch (event) {
3580 case RTM_NEWADDR:
40e22e8f 3581 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3582 if (ifp->idev->cnf.forwarding)
3583 addrconf_join_anycast(ifp);
3584 break;
3585 case RTM_DELADDR:
3586 if (ifp->idev->cnf.forwarding)
3587 addrconf_leave_anycast(ifp);
3588 addrconf_leave_solict(ifp->idev, &ifp->addr);
3589 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3590 if (ip6_del_rt(ifp->rt))
1da177e4 3591 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3592 break;
3593 }
3594}
3595
3596static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3597{
8814c4b5 3598 rcu_read_lock_bh();
1da177e4
LT		 3599 if (likely(ifp->idev->dead == 0))
3600 __ipv6_ifa_notify(event, ifp);
8814c4b5 3601 rcu_read_unlock_bh();
1da177e4
LT		 3602}
3603
3604#ifdef CONFIG_SYSCTL
3605
3606static
3607int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3608 void __user *buffer, size_t *lenp, loff_t *ppos)
3609{
3610 int *valp = ctl->data;
3611 int val = *valp;
3612 int ret;
3613
3614 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3615
3616 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3617 if (valp != &ipv6_devconf.forwarding) {
3618 if ((!*valp) ^ (!val)) {
3619 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3620 if (idev == NULL)
3621 return ret;
3622 dev_forward_change(idev);
3623 }
3624 } else {
3625 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3626 addrconf_forward_change();
3627 }
3628 if (*valp)
3629 rt6_purge_dflt_routers();
3630 }
3631
1ab1457c 3632 return ret;
1da177e4
LT		 3633}
3634
1ab1457c 3635static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3636 int __user *name, int nlen,
3637 void __user *oldval,
3638 size_t __user *oldlenp,
1f29bcd7 3639 void __user *newval, size_t newlen)
1da177e4
LT		 3640{
3641 int *valp = table->data;
3642 int new;
3643
3644 if (!newval || !newlen)
3645 return 0;
3646 if (newlen != sizeof(int))
3647 return -EINVAL;
3648 if (get_user(new, (int __user *)newval))
3649 return -EFAULT;
3650 if (new == *valp)
3651 return 0;
3652 if (oldval && oldlenp) {
3653 size_t len;
3654 if (get_user(len, oldlenp))
3655 return -EFAULT;
3656 if (len) {
3657 if (len > table->maxlen)
3658 len = table->maxlen;
3659 if (copy_to_user(oldval, valp, len))
3660 return -EFAULT;
3661 if (put_user(len, oldlenp))
3662 return -EFAULT;
3663 }
3664 }
3665
3666 if (valp != &ipv6_devconf_dflt.forwarding) {
3667 if (valp != &ipv6_devconf.forwarding) {
3668 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3669 int changed;
3670 if (unlikely(idev == NULL))
3671 return -ENODEV;
3672 changed = (!*valp) ^ (!new);
3673 *valp = new;
3674 if (changed)
3675 dev_forward_change(idev);
3676 } else {
3677 *valp = new;
3678 addrconf_forward_change();
3679 }
3680
3681 if (*valp)
3682 rt6_purge_dflt_routers();
3683 } else
3684 *valp = new;
3685
3686 return 1;
3687}
3688
3689static struct addrconf_sysctl_table
3690{
3691 struct ctl_table_header *sysctl_header;
3692 ctl_table addrconf_vars[__NET_IPV6_MAX];
3693 ctl_table addrconf_dev[2];
3694 ctl_table addrconf_conf_dir[2];
3695 ctl_table addrconf_proto_dir[2];
3696 ctl_table addrconf_root_dir[2];
ab32ea5d 3697} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3698 .sysctl_header = NULL,
3699 .addrconf_vars = {
1ab1457c 3700 {
1da177e4
LT		 3701 .ctl_name = NET_IPV6_FORWARDING,
3702 .procname = "forwarding",
1ab1457c 3703 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3704 .maxlen = sizeof(int),
3705 .mode = 0644,
1ab1457c 3706 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3707 .strategy = &addrconf_sysctl_forward_strategy,
3708 },
3709 {
3710 .ctl_name = NET_IPV6_HOP_LIMIT,
3711 .procname = "hop_limit",
1ab1457c 3712 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3713 .maxlen = sizeof(int),
3714 .mode = 0644,
3715 .proc_handler = proc_dointvec,
3716 },
3717 {
3718 .ctl_name = NET_IPV6_MTU,
3719 .procname = "mtu",
3720 .data = &ipv6_devconf.mtu6,
1ab1457c 3721 .maxlen = sizeof(int),
1da177e4 3722 .mode = 0644,
1ab1457c 3723 .proc_handler = &proc_dointvec,
1da177e4
LT		 3724 },
3725 {
3726 .ctl_name = NET_IPV6_ACCEPT_RA,
3727 .procname = "accept_ra",
1ab1457c 3728 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3729 .maxlen = sizeof(int),
3730 .mode = 0644,
1ab1457c 3731 .proc_handler = &proc_dointvec,
1da177e4
LT		 3732 },
3733 {
3734 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3735 .procname = "accept_redirects",
1ab1457c 3736 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3737 .maxlen = sizeof(int),
3738 .mode = 0644,
1ab1457c 3739 .proc_handler = &proc_dointvec,
1da177e4
LT		 3740 },
3741 {
3742 .ctl_name = NET_IPV6_AUTOCONF,
3743 .procname = "autoconf",
1ab1457c 3744 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3745 .maxlen = sizeof(int),
3746 .mode = 0644,
1ab1457c 3747 .proc_handler = &proc_dointvec,
1da177e4
LT		 3748 },
3749 {
3750 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3751 .procname = "dad_transmits",
1ab1457c 3752 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3753 .maxlen = sizeof(int),
3754 .mode = 0644,
1ab1457c 3755 .proc_handler = &proc_dointvec,
1da177e4
LT		 3756 },
3757 {
3758 .ctl_name = NET_IPV6_RTR_SOLICITS,
3759 .procname = "router_solicitations",
1ab1457c 3760 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3761 .maxlen = sizeof(int),
3762 .mode = 0644,
1ab1457c 3763 .proc_handler = &proc_dointvec,
1da177e4
LT		 3764 },
3765 {
3766 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3767 .procname = "router_solicitation_interval",
1ab1457c 3768 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3769 .maxlen = sizeof(int),
3770 .mode = 0644,
1ab1457c 3771 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3772 .strategy = &sysctl_jiffies,
3773 },
3774 {
3775 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3776 .procname = "router_solicitation_delay",
1ab1457c 3777 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3778 .maxlen = sizeof(int),
3779 .mode = 0644,
1ab1457c 3780 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3781 .strategy = &sysctl_jiffies,
3782 },
3783 {
3784 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3785 .procname = "force_mld_version",
1ab1457c 3786 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3787 .maxlen = sizeof(int),
3788 .mode = 0644,
1ab1457c 3789 .proc_handler = &proc_dointvec,
1da177e4
LT		 3790 },
3791#ifdef CONFIG_IPV6_PRIVACY
3792 {
3793 .ctl_name = NET_IPV6_USE_TEMPADDR,
3794 .procname = "use_tempaddr",
1ab1457c 3795 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3796 .maxlen = sizeof(int),
3797 .mode = 0644,
1ab1457c 3798 .proc_handler = &proc_dointvec,
1da177e4
LT		 3799 },
3800 {
3801 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3802 .procname = "temp_valid_lft",
1ab1457c 3803 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3804 .maxlen = sizeof(int),
3805 .mode = 0644,
1ab1457c 3806 .proc_handler = &proc_dointvec,
1da177e4
LT		 3807 },
3808 {
3809 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3810 .procname = "temp_prefered_lft",
1ab1457c 3811 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3812 .maxlen = sizeof(int),
3813 .mode = 0644,
1ab1457c 3814 .proc_handler = &proc_dointvec,
1da177e4
LT		 3815 },
3816 {
3817 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3818 .procname = "regen_max_retry",
1ab1457c 3819 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3820 .maxlen = sizeof(int),
3821 .mode = 0644,
1ab1457c 3822 .proc_handler = &proc_dointvec,
1da177e4
LT		 3823 },
3824 {
3825 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3826 .procname = "max_desync_factor",
1ab1457c 3827 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3828 .maxlen = sizeof(int),
3829 .mode = 0644,
1ab1457c 3830 .proc_handler = &proc_dointvec,
1da177e4
LT		 3831 },
3832#endif
3833 {
3834 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3835 .procname = "max_addresses",
3836 .data = &ipv6_devconf.max_addresses,
3837 .maxlen = sizeof(int),
3838 .mode = 0644,
3839 .proc_handler = &proc_dointvec,
3840 },
65f5c7c1
YH		 3841 {
3842 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3843 .procname = "accept_ra_defrtr",
1ab1457c 3844 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3845 .maxlen = sizeof(int),
3846 .mode = 0644,
1ab1457c 3847 .proc_handler = &proc_dointvec,
65f5c7c1 3848 },
c4fd30eb
YH		 3849 {
3850 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3851 .procname = "accept_ra_pinfo",
1ab1457c 3852 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3853 .maxlen = sizeof(int),
3854 .mode = 0644,
1ab1457c 3855 .proc_handler = &proc_dointvec,
c4fd30eb 3856 },
930d6ff2
YH		 3857#ifdef CONFIG_IPV6_ROUTER_PREF
3858 {
3859 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3860 .procname = "accept_ra_rtr_pref",
3861 .data = &ipv6_devconf.accept_ra_rtr_pref,
3862 .maxlen = sizeof(int),
3863 .mode = 0644,
3864 .proc_handler = &proc_dointvec,
3865 },
52e16356
YH		 3866 {
3867 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3868 .procname = "router_probe_interval",
3869 .data = &ipv6_devconf.rtr_probe_interval,
3870 .maxlen = sizeof(int),
3871 .mode = 0644,
3872 .proc_handler = &proc_dointvec_jiffies,
3873 .strategy = &sysctl_jiffies,
3874 },
fa03ef38 3875#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3876 {
3877 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3878 .procname = "accept_ra_rt_info_max_plen",
3879 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3880 .maxlen = sizeof(int),
3881 .mode = 0644,
3882 .proc_handler = &proc_dointvec,
3883 },
3884#endif
930d6ff2 3885#endif
fbea49e1
YH		 3886 {
3887 .ctl_name = NET_IPV6_PROXY_NDP,
3888 .procname = "proxy_ndp",
3889 .data = &ipv6_devconf.proxy_ndp,
3890 .maxlen = sizeof(int),
3891 .mode = 0644,
3892 .proc_handler = &proc_dointvec,
3893 },
0bcbc926
YH		 3894 {
3895 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
3896 .procname = "accept_source_route",
3897 .data = &ipv6_devconf.accept_source_route,
3898 .maxlen = sizeof(int),
3899 .mode = 0644,
3900 .proc_handler = &proc_dointvec,
3901 },
1da177e4
LT		 3902 {
3903 .ctl_name = 0, /* sentinel */
3904 }
3905 },
3906 .addrconf_dev = {
3907 {
3908 .ctl_name = NET_PROTO_CONF_ALL,
3909 .procname = "all",
3910 .mode = 0555,
3911 .child = addrconf_sysctl.addrconf_vars,
3912 },
3913 {
3914 .ctl_name = 0, /* sentinel */
3915 }
3916 },
3917 .addrconf_conf_dir = {
3918 {
3919 .ctl_name = NET_IPV6_CONF,
3920 .procname = "conf",
3921 .mode = 0555,
3922 .child = addrconf_sysctl.addrconf_dev,
3923 },
3924 {
3925 .ctl_name = 0, /* sentinel */
3926 }
3927 },
3928 .addrconf_proto_dir = {
3929 {
3930 .ctl_name = NET_IPV6,
3931 .procname = "ipv6",
3932 .mode = 0555,
3933 .child = addrconf_sysctl.addrconf_conf_dir,
3934 },
3935 {
3936 .ctl_name = 0, /* sentinel */
3937 }
3938 },
3939 .addrconf_root_dir = {
3940 {
3941 .ctl_name = CTL_NET,
3942 .procname = "net",
3943 .mode = 0555,
3944 .child = addrconf_sysctl.addrconf_proto_dir,
3945 },
3946 {
3947 .ctl_name = 0, /* sentinel */
3948 }
3949 },
3950};
3951
3952static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3953{
3954 int i;
3955 struct net_device *dev = idev ? idev->dev : NULL;
3956 struct addrconf_sysctl_table *t;
3957 char *dev_name = NULL;
3958
af879cc7 3959 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 3960 if (t == NULL)
3961 return;
1da177e4
LT		 3962 for (i=0; t->addrconf_vars[i].data; i++) {
3963 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 3964 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3965 }
3966 if (dev) {
1ab1457c 3967 dev_name = dev->name;
1da177e4
LT		 3968 t->addrconf_dev[0].ctl_name = dev->ifindex;
3969 } else {
3970 dev_name = "default";
3971 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3972 }
3973
1ab1457c
YH		 3974 /*
3975 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 3976 * by sysctl and we wouldn't want anyone to change it under our feet
3977 * (see SIOCSIFNAME).
1ab1457c 3978 */
543537bd 3979 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 3980 if (!dev_name)
3981 goto free;
3982
3983 t->addrconf_dev[0].procname = dev_name;
3984
3985 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 3986 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 3987 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 3988 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 3989
0b4d4147 3990 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 3991 if (t->sysctl_header == NULL)
3992 goto free_procname;
3993 else
3994 p->sysctl = t;
3995 return;
3996
3997 /* error path */
3998 free_procname:
3999 kfree(dev_name);
4000 free:
4001 kfree(t);
4002
4003 return;
4004}
4005
4006static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4007{
4008 if (p->sysctl) {
4009 struct addrconf_sysctl_table *t = p->sysctl;
4010 p->sysctl = NULL;
4011 unregister_sysctl_table(t->sysctl_header);
4012 kfree(t->addrconf_dev[0].procname);
4013 kfree(t);
4014 }
4015}
4016
4017
4018#endif
4019
4020/*
4021 * Device notifier
4022 */
4023
4024int register_inet6addr_notifier(struct notifier_block *nb)
4025{
1ab1457c 4026 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4027}
4028
7159039a
YH		 4029EXPORT_SYMBOL(register_inet6addr_notifier);
4030
1da177e4
LT		 4031int unregister_inet6addr_notifier(struct notifier_block *nb)
4032{
1ab1457c 4033 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4034}
4035
7159039a
YH		 4036EXPORT_SYMBOL(unregister_inet6addr_notifier);
4037
1da177e4
LT		 4038/*
4039 * Init / cleanup code
4040 */
4041
4042int __init addrconf_init(void)
4043{
4044 int err = 0;
4045
4046 /* The addrconf netdev notifier requires that loopback_dev
4047 * has it's ipv6 private information allocated and setup
4048 * before it can bring up and give link-local addresses
4049 * to other devices which are up.
4050 *
4051 * Unfortunately, loopback_dev is not necessarily the first
4052 * entry in the global dev_base list of net devices. In fact,
4053 * it is likely to be the very last entry on that list.
4054 * So this causes the notifier registry below to try and
4055 * give link-local addresses to all devices besides loopback_dev
4056 * first, then loopback_dev, which cases all the non-loopback_dev
4057 * devices to fail to get a link-local address.
4058 *
4059 * So, as a temporary fix, allocate the ipv6 structure for
4060 * loopback_dev first by hand.
4061 * Longer term, all of the dependencies ipv6 has upon the loopback
4062 * device and it being up should be removed.
4063 */
4064 rtnl_lock();
4065 if (!ipv6_add_dev(&loopback_dev))
4066 err = -ENOMEM;
4067 rtnl_unlock();
4068 if (err)
4069 return err;
4070
c62dba90
HX		 4071 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4072
1da177e4
LT		 4073 register_netdevice_notifier(&ipv6_dev_notf);
4074
1da177e4
LT		 4075 addrconf_verify(0);
4076 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4077#ifdef CONFIG_SYSCTL
4078 addrconf_sysctl.sysctl_header =
0b4d4147 4079 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4080 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4081#endif
4082
4083 return 0;
4084}
4085
4086void __exit addrconf_cleanup(void)
4087{
1ab1457c
YH		 4088 struct net_device *dev;
4089 struct inet6_dev *idev;
4090 struct inet6_ifaddr *ifa;
1da177e4
LT		 4091 int i;
4092
4093 unregister_netdevice_notifier(&ipv6_dev_notf);
4094
4095 rtnetlink_links[PF_INET6] = NULL;
4096#ifdef CONFIG_SYSCTL
4097 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4098 addrconf_sysctl_unregister(&ipv6_devconf);
4099#endif
4100
4101 rtnl_lock();
4102
4103 /*
4104 * clean dev list.
4105 */
4106
4107 for (dev=dev_base; dev; dev=dev->next) {
4108 if ((idev = __in6_dev_get(dev)) == NULL)
4109 continue;
4110 addrconf_ifdown(dev, 1);
4111 }
4112 addrconf_ifdown(&loopback_dev, 2);
4113
4114 /*
4115 * Check hash table.
4116 */
4117
4118 write_lock_bh(&addrconf_hash_lock);
4119 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4120 for (ifa=inet6_addr_lst[i]; ifa; ) {
4121 struct inet6_ifaddr *bifa;
4122
4123 bifa = ifa;
4124 ifa = ifa->lst_next;
4125 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4126 /* Do not free it; something is wrong.
4127 Now we can investigate it with debugger.
4128 */
4129 }
4130 }
4131 write_unlock_bh(&addrconf_hash_lock);
4132
4133 del_timer(&addr_chk_timer);
4134
4135 rtnl_unlock();
4136
1da177e4
LT		 4137#ifdef CONFIG_PROC_FS
4138 proc_net_remove("if_inet6");
4139#endif
4140}
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